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GH-40703: [CI][Packaging] Homebrew can't install Python 3.12 on GHA runners (#40704)

### Rationale for this change

The hombrew-cpp nightly job is failing.

### What changes are included in this PR?

Force install install for Python 3.12

### Are these changes tested?

Via archery

### Are there any user-facing changes?

No
* GitHub Issue: #40703

Authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>