chore(librarian): temporarily bump nox session timeout to 20 minutes (#15009)

This PR is needed to help debug the issue in 14992.

Towards #14992

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: parthea

.generator/cli.py

@@ -1039,7 +1039,8 @@ def _run_individual_session(
         "-f",
         f"{library_path}/noxfile.py",
     ]
-    result = subprocess.run(command, text=True, check=True, timeout=600)
+    # TODO(#14992): Revert to 600 seconds (10 minutes) after debugging is complete.
+    result = subprocess.run(command, text=True, check=True, timeout=1200)
     logger.info(result)
 
 

.generator/test_cli.py

@@ -758,7 +758,7 @@ def test_run_individual_session_success(mocker, caplog, is_mono_repo):
         ),
     ]
     mock_subprocess_run.assert_called_once_with(
-        expected_command, text=True, check=True, timeout=600
+        expected_command, text=True, check=True, timeout=1200
     )