grab-site: 2.2.0 -> 2.2.2; pythonPackages.ludios_wpull: 3.0.7 -> 3.0.9
Use SQLAlchemy 1.3 because ludios_wpull is incompatible with SQLAlchemy 1.4.
Use Python 3.8 instead of Python 3.7, as namedlist 1.8 fixed compatibility
with Python 3.8. We cannot use Python 3.9 until
https://github.com/ArchiveTeam/ludios_wpull/issues/20 is fixed.