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GH-45378: [CI][R] Increase timeout of test-ubuntu-r-sanitizer job (#45379)

### Rationale for this change

The job is currently timing out.

### What changes are included in this PR?

Increase timeout

### Are these changes tested?

Via archery

### Are there any user-facing changes?

No
* GitHub Issue: #45378

Authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>