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 <[email protected]>
Signed-off-by: Raúl Cumplido <[email protected]>

Author: raulcd

dev/tasks/tasks.yml

@@ -1315,6 +1315,7 @@ tasks:
       env:
         R_PRUNE_DEPS: TRUE
       image: ubuntu-r-sanitizer
+      timeout: 120
 
   test-r-clang-sanitizer:
     ci: github