Upgrading to 3.1.3 yields 401 Unauthorized error

### Apache Airflow version 3.1.3 ### If "Other Airflow 2/3 version" selected, which one? _No response_ ### What happened? I tried to upgrade my airflow helm chart from version 3.0.2 to version 3.1.3. I started with a fresh database and namespace, but when I try to access airflow at http://airflow.staging.mydomain.cloud I get redirected to http://airflow.staging.mydomain.cloud/auth/login/?next=http://airflow.staging.mydomain.cloud/ and it shows `Internal Server Error`. Inspecting the api-server logs I found this: ``` INFO: 10.42.5.9:48748 - "GET /ui/config HTTP/1.1" 401 Unauthorized INFO: 10.42.5.9:48754 - "GET /static/i18n/locales/en/common.json HTTP/1.1" 304 Not Modified INFO: 10.42.5.9:48748 - "GET /static/i18n/locales/en/dashboard.json HTTP/1.1" 304 Not Modified INFO: 10.42.5.9:48768 - "GET /static/i18n/locales/en/dags.json HTTP/1.1" 304 Not Modified INFO: 10.42.5.9:48786 - "GET /static/i18n/locales/en/assets.json HTTP/1.1" 304 Not Modified INFO: 10.42.5.9:48774 - "GET /static/i18n/locales/en/components.json HTTP/1.1" 304 Not Modified INFO: 10.42.5.9:48748 - "GET /static/i18n/locales/en/browse.json HTTP/1.1" 304 Not Modified INFO: 10.42.5.9:48754 - "GET /static/i18n/locales/en/admin.json HTTP/1.1" 304 Not Modified INFO: 10.42.5.9:48792 - "GET /static/i18n/locales/en/hitl.json HTTP/1.1" 304 Not Modified INFO: 10.42.5.9:48792 - "GET /api/v2/auth/login?next=http%3A%2F%2Fairflow.staging.translated.cloud%2F HTTP/1.1" 307 Temporary Redirect 2025-12-10T15:27:14.185556Z [error ] Exception in callback <function TaskGroup._spawn.<locals>.task_done at 0x74592c24fb00> handle: <Handle TaskGroup._spawn.<locals>.task_done> [asyncio] loc=runners.py:118 Traceback (most recent call last): File "uvloop/cbhandles.pyx", line 63, in uvloop.loop.Handle._run File "/home/airflow/.local/lib/python3.11/site-packages/anyio/_backends/_asyncio.py", line 820, in task_done self._on_completed_fut.set_result(None) asyncio.exceptions.InvalidStateE…