### Describe the enhancement requested There's a pin in conda_env_cpp.txt for grpc-cpp, https://github.com/apache/arrow/blob/79c214c964f15d3635e548dd18ce42eb22ec9c5c/ci/conda_env_cpp.txt#L34 which was introduced in https://github.com/apache/arrow/commit/2daa0c3e4a00ffd0392dcbd5f6b8dd7e01e1ec6a to fix test failures. In https://github.com/apache/arrow/issues/44868 we found it may cause issues for some users and require a manual workaround. We should re-check whether we can remove the pin in the future. ### Component(s) C++, Packaging