Add missing imports

maubot/standalone/config.py

@@ -13,6 +13,9 @@
 #
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
+from typing import Any
+import os
+
 from mautrix.util.config import BaseFileConfig, ConfigUpdateHelper