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/google.golang.org/grpc/balancer/roundrobin/roundrobin.go

@@ -22,12 +22,12 @@
 package roundrobin
 
 import (
+	"math/rand"
 	"sync/atomic"
 
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/balancer/base"
 	"google.golang.org/grpc/grpclog"
-	"google.golang.org/grpc/internal/grpcrand"
 )
 
 // Name is the name of round_robin balancer.
@@ -60,7 +60,7 @@ func (*rrPickerBuilder) Build(info base.PickerBuildInfo) balancer.Picker {
 		// Start at a random index, as the same RR balancer rebuilds a new
 		// picker when SubConn states change, and we don't want to apply excess
 		// load to the first server in the list.
-		next: uint32(grpcrand.Intn(len(scs))),
+		next: uint32(rand.Intn(len(scs))),
 	}
 }