This commit upgrades gRPC to protobuf v25.0 and makes some fixes to account for upb changes. One major change is that upb has been merged into the protobuf repo, so we can now drop the separate `@upb` dependency. Another is that `.upb.c` files no longer exist and there are new `.upb_minitable.h` and `.upb_minitable.c` files. The longer filenames exceeded a Windows restriction, so to work around that I renamed the `upb-generated` directory to just `upb-gen`, and likewise for `upbdefs-generated`. |
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