Relax requires-python to >=3.11.0 (#2561)

This eases upgrading the Python version on production. It is also not
generally recommended to have upper bounds, see for example the footnote
in the docs here:
https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#python-requires

Author: niklasmohrin

pyproject.toml

@@ -3,7 +3,7 @@ name = "evap"
 description = "EvaP"
 version = "2025.10.0"
 readme = "README.md"
-requires-python = "~=3.11.0"
+requires-python = ">=3.11.0"
 dependencies = [
     "django-extensions~=4.1.0",
     "django-fsm~=2.8.2",