This reverts commit d7032199.

DBAL-54 was fixed in commit 3d55dc8e by
changing SQL queries order. However it was later reintroduced.

This patch uses a different, more future-proof way, approach by using
DROP SEQUENCE ... CASCADE syntax, and thus does not depend on queries order.

fix :: operator in sql parser

regex pattern does not support sql casting using :: operator for example select mydate::date from mytable;

Remove test for 2.3 branch

Upgrading doctrine/common 2.4 (via composer)