Symfony version(s) affected: 5.3.9

Description
Discovered while working on #43630. The Postgres-specific logic in PostgreSqlConnection::get() is not covered by integration tests. This is why an API change between DBAL 2 and 3 was not found by the test suite.

Possible Solution
We already run integration from other components tests against a real Postgres database. We should do the same for the Messenger.