Bump google.golang.org/grpc from 1.61.1 to 1.62.1

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.61.1 to 1.62.1.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.61.1...v1.62.1)

---
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/internal/grpcrand/grpcrand.go

@@ -1,3 +1,8 @@
+//go:build !go1.21
+
+// TODO: when this file is deleted (after Go 1.20 support is dropped), delete
+// all of grpcrand and call the rand package directly.
+
 /*
  *
  * Copyright 2018 gRPC authors.