Drop support for python 3.7 in CI

[CloCkWeRX]

In CI:

1 error and 1 warning
build (3.7)
failed on Dec 10, 2024 in 3s

Run actions/setup-python@v2
Version 3.7 was not found in the local cache
Error: Version 3.[7](https://github.com/JeffLIrion/python-androidtv/actions/runs/12251553974/job/34176401558#step:3:8) with arch x64 not found
The list of all available versions can be found here: https://raw.githubusercontent.com/actions/python-versions/main/versions-manifest.json