Using grpc-bom instead of listing individual libraries

Recently I found that `grpc-xds` is missing from `libraries-bom`. (for this [PR](https://github.com/apache/beam/pull/17486)) This is a relatively new grpc module, which is probably why it ended up being missing. Solution to make sure that all grpc modules included would be using [grpc-bom](https://mvnrepository.com/artifact/io.grpc/grpc-bom) instead of [listing them](https://github.com/GoogleCloudPlatform/cloud-opensource-java/blob/4cbb99a9f214a44cead346b07edd9b4beb5ecb6c/boms/cloud-oss-bom/pom.xml#L149-L219).