What version of gRPC-Java are you using?

v1.56.0

What is your environment?

MacOS/Linux arm64

What did you expect to see?

Following instructions in COMPILING.md should result in a successful build.

What did you see instead?

https://github.com/grpc/grpc-java/blob/f3399e3d0e52c4c20409de3b4435fea12bec12c6/COMPILING.md#how-to-build-code-generation-plugin refers to the protobuf-all artifact, which is no longer shipped with newer releases (grpc-java requires protoc 22.3). It also refers to using autotools to build protoc from source, which is no longer supported (ref: https://protobuf.dev/news/2022-08-03/).

Steps to reproduce the bug

Attempt to follow the steps in COMPILING.md to build grpc-java (including the compiler).