Catch PDOException

When using PDO, an exception is supposed to be thrown since we are using
the error mode that behaves that way. It only seems to be the case since
PHP 8 though.

tests/Doctrine/Tests/DBAL/Functional/TransactionTest.php

@@ -4,6 +4,7 @@
 
 use Doctrine\DBAL\Platforms\MySqlPlatform;
 use Doctrine\Tests\DbalFunctionalTestCase;
+use PDOException;
 
 use function sleep;
 
@@ -35,6 +36,12 @@ public function testCommitFalse(): void
 
         sleep(2); // during the sleep mysql will close the connection
 
-        $this->assertFalse(@$this->connection->commit()); // we will ignore `MySQL server has gone away` warnings
+        try {
+            $this->assertFalse(@$this->connection->commit()); // we will ignore `MySQL server has gone away` warnings
+        } catch (PDOException $e) {
+            /* For PDO, we are using ERRMODE EXCEPTION, so this catch should be
+             * necessary as the equivalent of the error control operator above.
+             * This seems to be the case only since PHP 8 */
+        }
     }
 }