[PRQ#50328] Deletion Request for python-alembic-1.4.1

MarsSeed [1] filed a deletion request for python-alembic-1.4.1 [2]: Nothing on AUR depends on this legacy version anymore. I only updated the PKGBUILD to remove its former provides=python- alembic, as this is not a feature-equivalent drop-in replacement of repo's python-alembic. It's safe to delete it. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/python-alembic-1.4.1/