Updated the protobuf dependency to version 30.0.

[odisseus]

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• [ ] I have filed an issue about this change and discussed potential changes with the maintainers.
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[odisseus]

Here's the error message. I'm not quite sure what to do with this.

bazel-out/x64_windows-opt-exec-ST-d57f47055a04/bin/external/protobuf+/src/google/protobuf/_virtual_includes/port\google/protobuf/port_def.inc(119): 
error C2338: static_assert failed: 'Protobuf only supports C++17 and newer.'