C++ Library Build Failure with gRPC 1.34+

I tried to update Homebrew's version of gRPC at https://github.com/Homebrew/homebrew-core/pull/69649. However, CI reported build failures from Apache Arrow.

Among the reported errors include:
error: implicit instantiation of undefined template
error: incomplete definition of type
error: implicit instantiation of undefined template

Complete CI run logs available at https://github.com/Homebrew/homebrew-core/actions/runs/506756245.

Will Apache Arrow be compatible with the latest version of gRPC? (As an aside, the lack of compatibility with LLVM 11 is also blocking Homebrew from packaging it for Apple M1.)