tadeja 771205b004 GH-49435: [CI][C++] Fix macOS build with Homebrew protobuf v34 (#49491) ...

### Rationale for this change
Closes #49435

### What changes are included in this PR?
a) Add brew update to `cpp.yml` and `python.yml` for GitHub Actions runner to use updated formulae
b) Handle 'nodiscard' return values in Flight and Substrait

See https://github.com/grpc/grpc/issues/41755
(See also previous discussion in [#49436](https://github.com/apache/arrow/pull/49436#issuecomment-4003351021))

### Are these changes tested?
Yes, macOS C++ and Python CI jobs pass.

### Are there any user-facing changes?
No.
* GitHub Issue: #49435

Lead-authored-by: Tadeja Kadunc <tadeja.kadunc@gmail.com>
Co-authored-by: tadeja <tadeja@users.noreply.github.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>

2026-03-12 16:58:32 +01:00

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