bazel_worker_java uses explicit versions of Maven artifacts instead of BOMs

Explicit artifact dependencies take precedence over BOMs, at least as of rules_jvm_external@6.9. This means that if a downstream module uses `com.google.protobuf:protobuf-bom`, the version specified there will be overridden by the artifact versions specified by bazel_worker_java. The fix is for bazel_worker_java to use `com.google.protobuf:protobuf-bom` instead.

The same is true for guava and `com.google.guava:guava-bom`