rebase: bump google.golang.org/grpc from 1.49.0 to 1.50.1

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.49.0 to 1.50.1.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.49.0...v1.50.1)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

@@ -244,7 +244,7 @@ type DoneInfo struct {
 	// ServerLoad is the load received from server. It's usually sent as part of
 	// trailing metadata.
 	//
-	// The only supported type now is *orca_v1.LoadReport.
+	// The only supported type now is *orca_v3.LoadReport.
 	ServerLoad interface{}
 }
 

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

@@ -22,7 +22,7 @@
 package roundrobin
 
 import (
-	"sync"
+	"sync/atomic"
 
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/balancer/base"
@@ -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: grpcrand.Intn(len(scs)),
+		next: uint32(grpcrand.Intn(len(scs))),
 	}
 }
 
@@ -69,15 +69,13 @@ type rrPicker struct {
 	// created. The slice is immutable. Each Get() will do a round robin
 	// selection from it and return the selected SubConn.
 	subConns []balancer.SubConn
-
-	mu   sync.Mutex
-	next int
+	next     uint32
 }
 
 func (p *rrPicker) Pick(balancer.PickInfo) (balancer.PickResult, error) {
-	p.mu.Lock()
-	sc := p.subConns[p.next]
-	p.next = (p.next + 1) % len(p.subConns)
-	p.mu.Unlock()
+	subConnsLen := uint32(len(p.subConns))
+	nextIndex := atomic.AddUint32(&p.next, 1)
+
+	sc := p.subConns[nextIndex%subConnsLen]
 	return balancer.PickResult{SubConn: sc}, nil
 }