Drop support for Python 3.7 #2790
Description
Potential subtasks:
- Add deprecation warning for Python 3.7 to
NOTES.rstandCHANGELOG.md#2890 - Upgrade sphinx to version newer than 5.3.0 #2826
- Possibly update
AbstractChecker.run()in nav/statemon/abstractchecker.py to newer Python #2839 - Remove an adaptation to Pythons older than 3.7 #2840
- Remove Python 3.7 from default test matrix #2891
- Update required PostgreSQL version to 13 #2892