build(deps): bump the otel group across 1 directory with 8 updates

Bumps the otel group with 5 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc](https://github.com/open-telemetry/opentelemetry-go-contrib) | `0.51.0` | `0.53.0` |
| [go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp](https://github.com/open-telemetry/opentelemetry-go-contrib) | `0.51.0` | `0.53.0` |
| [go.opentelemetry.io/otel/exporters/otlp/otlptrace](https://github.com/open-telemetry/opentelemetry-go) | `1.26.0` | `1.28.0` |
| [go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc](https://github.com/open-telemetry/opentelemetry-go) | `1.26.0` | `1.28.0` |
| [go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp](https://github.com/open-telemetry/opentelemetry-go) | `1.26.0` | `1.28.0` |



Updates `go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc` from 0.51.0 to 0.53.0
- [Release notes](https://github.com/open-telemetry/opentelemetry-go-contrib/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-go-contrib/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-go-contrib/compare/zpages/v0.51.0...zpages/v0.53.0)

Updates `go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp` from 0.51.0 to 0.53.0
- [Release notes](https://github.com/open-telemetry/opentelemetry-go-contrib/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-go-contrib/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-go-contrib/compare/zpages/v0.51.0...zpages/v0.53.0)

Updates `go.opentelemetry.io/otel` from 1.26.0 to 1.28.0
- [Release notes](https://github.com/open-telemetry/opentelemetry-go/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-go/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-go/compare/v1.26.0...v1.28.0)

Updates `go.opentelemetry.io/otel/exporters/otlp/otlptrace` from 1.26.0 to 1.28.0
- [Release notes](https://github.com/open-telemetry/opentelemetry-go/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-go/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-go/compare/v1.26.0...v1.28.0)

Updates `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc` from 1.26.0 to 1.28.0
- [Release notes](https://github.com/open-telemetry/opentelemetry-go/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-go/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-go/compare/v1.26.0...v1.28.0)

Updates `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp` from 1.26.0 to 1.28.0
- [Release notes](https://github.com/open-telemetry/opentelemetry-go/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-go/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-go/compare/v1.26.0...v1.28.0)

Updates `go.opentelemetry.io/otel/sdk` from 1.26.0 to 1.28.0
- [Release notes](https://github.com/open-telemetry/opentelemetry-go/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-go/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-go/compare/v1.26.0...v1.28.0)

Updates `go.opentelemetry.io/otel/trace` from 1.26.0 to 1.28.0
- [Release notes](https://github.com/open-telemetry/opentelemetry-go/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-go/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-go/compare/v1.26.0...v1.28.0)

---
updated-dependencies:
- dependency-name: go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: otel
- dependency-name: go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: otel
- dependency-name: go.opentelemetry.io/otel
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: otel
- dependency-name: go.opentelemetry.io/otel/exporters/otlp/otlptrace
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: otel
- dependency-name: go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: otel
- dependency-name: go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: otel
- dependency-name: go.opentelemetry.io/otel/sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: otel
- dependency-name: go.opentelemetry.io/otel/trace
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: otel
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/grpc-ecosystem/grpc-gateway/v2/runtime/context.go

@@ -148,6 +148,12 @@ func annotateContext(ctx context.Context, mux *ServeMux, req *http.Request, rpcM
 	var pairs []string
 	for key, vals := range req.Header {
 		key = textproto.CanonicalMIMEHeaderKey(key)
+		switch key {
+		case xForwardedFor, xForwardedHost:
+			// Handled separately below
+			continue
+		}
+
 		for _, val := range vals {
 			// For backwards-compatibility, pass through 'authorization' header with no prefix.
 			if key == "Authorization" {
@@ -181,18 +187,17 @@ func annotateContext(ctx context.Context, mux *ServeMux, req *http.Request, rpcM
 		pairs = append(pairs, strings.ToLower(xForwardedHost), req.Host)
 	}
 
+	xff := req.Header.Values(xForwardedFor)
 	if addr := req.RemoteAddr; addr != "" {
 		if remoteIP, _, err := net.SplitHostPort(addr); err == nil {
-			if fwd := req.Header.Get(xForwardedFor); fwd == "" {
-				pairs = append(pairs, strings.ToLower(xForwardedFor), remoteIP)
-			} else {
-				pairs = append(pairs, strings.ToLower(xForwardedFor), fmt.Sprintf("%s, %s", fwd, remoteIP))
-			}
+			xff = append(xff, remoteIP)
 		}
 	}
+	if len(xff) > 0 {
+		pairs = append(pairs, strings.ToLower(xForwardedFor), strings.Join(xff, ", "))
+	}
 
 	if timeout != 0 {
-		//nolint:govet  // The context outlives this function
 		ctx, _ = context.WithTimeout(ctx, timeout)
 	}
 	if len(pairs) == 0 {