Fix `dict` conversion of `Row`
Fix `dict` conversion of `Row`

See
https://docs.sqlalchemy.org/en/14/changelog/migration_20.html#result-rows-act-like-named-tuples

Refs #471

agdsn/pycroft,agdsn/pycroft,agdsn/pycroft,agdsn/pycroft,agdsn/pycroft