fix(deps): update dependency protobuf to v5.28.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
protobuf	==5.27.2 -> ==5.28.3

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[negz]

I'm going to leave this one for the moment.

I tried bumping the protobuf version locally and running hatch generate:protoc, but I still see the files are generated with 5.27.2. I get the same error this PR does when I run the unit tests.

Perhaps this is because we're using grpc_tools.protoc to generate the files, and that that tool needs updating?

[bobh66]

Perhaps this is because we're using grpc_tools.protoc to generate the files, and that that tool needs updating?

Yes - the same error occurred in #86 and #88