PrimaryReadReplicaConnectionTest::testInheritCharsetFromPrimary() is failing on CI

[morozov]

The failure looks like the following:

1) Doctrine\DBAL\Tests\Functional\PrimaryReadReplicaConnectionTest::testInheritCharsetFromPrimary
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-'utf8'
+'utf8mb3'

Note that as of MySQL 8.0, the utf8 character set is an alias for utf8mb3.