build(deps): bump google.golang.org/grpc

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.59.0 to 1.64.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.59.0...v1.64.0)

---
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>

examples/load-reporting-service/go.mod

@@ -3,7 +3,7 @@ module github.com/envoyproxy/envoy/examples/load-reporting-service
 go 1.13
 
 require (
-	github.com/envoyproxy/go-control-plane v0.11.1
-	github.com/golang/protobuf v1.5.3
-	google.golang.org/grpc v1.59.0
+	github.com/envoyproxy/go-control-plane v0.12.0
+	github.com/golang/protobuf v1.5.4
+	google.golang.org/grpc v1.64.0
 )