Update database.py - clickhouse new version# 21.8.15.15.altinitystable broke this code

[palmtree100]

        # The version# of clickhouse new release via Altinity is something like this: 21.8.15.15.altinitystable, a string at the end
        # this broke this piece of script if it is called from sqlalchemy or any other python library.
        # below is a kind of workaroud to only take the digits and dot, believe some more solid way might needed.