CI: skip cPython 3.7 (EoL)

Author: pajod

Diff for: .github/workflows/tox.yml

@@ -21,8 +21,7 @@ jobs:
          - macos-13
          # Not testing Windows, because tests need Unix-only fcntl, grp, pwd, etc.
         python-version:
-         # CPython <= 3.7 is EoL since 2023-06-27
-         - "3.7"
+         # CPython <= 3.8 is EoL since 2024-10-07 https://peps.python.org/pep-0569/
          - "3.8"
          - "3.9"
          - "3.10"