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GH-44314: [Packaging][Python] Use macOS 12 as deployment target to have macOS 12 pyarrow wheels (#44315)

### Rationale for this change

We did just bump MACOSX_DEPLOYMENT_TARGET from 10 to 12 for pyarrow wheels on 18.0.0, we probably should wait a little before dropping.

### What changes are included in this PR?

Revert moving macOS deployment target to 12

### Are these changes tested?

Will trigger wheel jobs on archery

### Are there any user-facing changes?

Yes, wheels will be available for macOS 12.
* GitHub Issue: #44314

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