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GH-37433: [CI][Release] Increase timeout for macOS (#37530)

### Rationale for this change

It seems that running ci/scripts/release_test.sh on macOS may take 10+ minutes. (Normally, it's finished in 5-10 minutes.)

### What changes are included in this PR?

Increase timeout to 15 minutes.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* Closes: #37433

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