Incompatible with protobuf 30.0

Description:

Currently I'm struggling to build this package against protobuf 30.0 as the protobuf upstream has removed a few headers and we get stuck on an error like this:

    5 grpc_tools/main.cc:20:10: fatal error: google/protobuf/compiler/python/       generator.h: No such file or directory
    4    20 | #include <google/protobuf/compiler/python/generator.h>
    3     ¦ |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    2 compilation terminated.
    1 error: command '/usr/bin/g++' failed with exit code 1

The issue is that the protobuf upstream people claim that we're building grpc in an unsupported way (see the linked issue) and I'm not sure about the path forward now, as this is one of the last packages blocking the rebuild. If anybody has any input on this (especially @mtorromeo) this would be highly appreciated 🤔

Additional info: