python: downgrade to python 3.11

Keeping the requirement to 3.13 makes it incompatible with our current plans
to use it from https://jumpstarter.dev, see [1].

i.e. current ubuntu LTS: 3.12, fedora 42 already ships 3.13, centos10 ships python 3.12

[1] https://github.com/jumpstarter-dev/jumpstarter/pull/771

Author: mangelajo

pyproject.toml

@@ -12,7 +12,7 @@ authors = [
 ]
 readme = "README.md"
 license = {text = "Apache-2.0"}
-requires-python = ">=3.13"
+requires-python = ">=3.11"
 dependencies = [
     "aiohttp",
     "cryptography",