GH-43847: [CI][C++][Python] Try to trigger binary installation of grpcio

[pitrou]

Rationale for this change

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

• GitHub Issue: [C++][CI] Python grpcio built from source on ARM64 Ubuntu 20.04 build #43847

[github-actions]

⚠️ GitHub issue #43847has been automatically assigned in GitHub to PR creator.

[pitrou]

@github-actions crossbow submit -g cpp

[github-actions]

Revision: 6a801f8

Submitted crossbow builds: ursacomputing/crossbow @ actions-053e7fb04b

Task	Status
test-alpine-linux-cpp
test-build-cpp-fuzz
test-conda-cpp
test-conda-cpp-valgrind
test-cuda-cpp
test-debian-12-cpp-amd64
test-debian-12-cpp-i386
test-fedora-39-cpp
test-ubuntu-20.04-cpp
test-ubuntu-20.04-cpp-bundled
test-ubuntu-20.04-cpp-minimal-with-formats
test-ubuntu-20.04-cpp-thread-sanitizer
test-ubuntu-22.04-cpp
test-ubuntu-22.04-cpp-20
test-ubuntu-22.04-cpp-emscripten
test-ubuntu-22.04-cpp-no-threading
test-ubuntu-24.04-cpp
test-ubuntu-24.04-cpp-gcc-13-bundled
test-ubuntu-24.04-cpp-gcc-14

[pitrou]

Hmm, it sounds like we should solve #38183 first to avoid conflicts between system packages and our installation of the GCS testbench.

[pitrou]

This is superseded by #43852, which fixed the issue