update OpenTelemetry dependencies and grpc

This update dropped the otelgrpc → cloud.google.com/go/compute dependency,
among others. This dropped out because genproto cleaned up it's dependencies
on google cloud libraries, and otel updated - details in #113366.

Signed-off-by: Davanum Srinivas <davanum@gmail.com>
Co-Authored-By: David Ashpole <dashpole@google.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 {