Prefect requires Sqlalchemy2

[Zharktas]

Describe the bug
Prefect has a requirement of sqlalchemy2 https://github.com/PrefectHQ/prefect/blob/57ee2c2c10f662fee32807c126a117adce32dd28/pyproject.toml#L40

CKAN only has support for 2.12 ckan/ckan#8410

Installing datapusher-plus requirements will upgrade sqlalchemy and you'll end up with various issues.

To Reproduce
Steps to reproduce the behavior:

1. Install ckan 2.11
2. Install datapusher_plus
3. Check sqlalchemy version with pip list