Use protobuf-java 4.29.2

[loudmouth]

Fixes #392

All the things I reported in #392 suggested that there was a mismatch between protobuf-java and protoc. The documentation for protobuf and protobuf-java states:

Make sure the version number of the runtime matches (or is newer than) the version number of the protoc.

I confirmed that this works by adding the following to my own project and have now succesesfully built java_proto_library and java_grpc_library that usedon repeated enum:

# both of these are needed to properly override the rules_proto_grpc_java
bazel_dep(name = "rules_proto_grpc", version = "5.0.1")
git_override(
    module_name = "rules_proto_grpc",
    commit = "fdc3c887479dfe8da152c4863393388da0f40dfa",
    remote = "https://github.com/justtechnologies/rules_proto_grpc",
    strip_prefix = "modules/core",
)
bazel_dep(name = "rules_proto_grpc_java", version = "5.0.1")
git_override(
    module_name = "rules_proto_grpc_java",
    commit = "fdc3c887479dfe8da152c4863393388da0f40dfa",
    remote = "https://github.com/justtechnologies/rules_proto_grpc",
    strip_prefix = "modules/java",
)

[aaliddell]

Hi, the released version 5.1.0 contains aligned protobuf-java and protoc version of 30.2