bin: Fix typos

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22189>

bin/gen_calendar_entries_test.py

@@ -52,7 +52,7 @@ def mock_csv(data: typing.List[gen_calendar_entries.CalendarRowType]) -> typing.
 
 @pytest.fixture(autouse=True, scope='module')
 def disable_git_commits() -> None:
-    """Mock out the commit function so no git commits are made durring testing."""
+    """Mock out the commit function so no git commits are made during testing."""
     with mock.patch('bin.gen_calendar_entries.commit', mock.Mock()):
         yield