rebase: bump google.golang.org/grpc from 1.59.0 to 1.60.1

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.59.0 to 1.60.1.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.59.0...v1.60.1)

---
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/resolver/manual/manual.go

@@ -78,12 +78,12 @@ func (r *Resolver) InitialState(s resolver.State) {
 func (r *Resolver) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
 	r.BuildCallback(target, cc, opts)
 	r.mu.Lock()
+	defer r.mu.Unlock()
 	r.CC = cc
 	if r.lastSeenState != nil {
 		err := r.CC.UpdateState(*r.lastSeenState)
 		go r.UpdateStateCallback(err)
 	}
-	r.mu.Unlock()
 	return r, nil
 }
 
@@ -105,15 +105,22 @@ func (r *Resolver) Close() {
 // UpdateState calls CC.UpdateState.
 func (r *Resolver) UpdateState(s resolver.State) {
 	r.mu.Lock()
-	err := r.CC.UpdateState(s)
+	defer r.mu.Unlock()
+	var err error
+	if r.CC == nil {
+		panic("cannot update state as grpc.Dial with resolver has not been called")
+	}
+	err = r.CC.UpdateState(s)
 	r.lastSeenState = &s
-	r.mu.Unlock()
 	r.UpdateStateCallback(err)
 }
 
 // ReportError calls CC.ReportError.
 func (r *Resolver) ReportError(err error) {
 	r.mu.Lock()
+	defer r.mu.Unlock()
+	if r.CC == nil {
+		panic("cannot report error as grpc.Dial with resolver has not been called")
+	}
 	r.CC.ReportError(err)
-	r.mu.Unlock()
 }