fix tests with Doctrine DBAL < 4

Author: xabbuh

src/Symfony/Component/Messenger/Bridge/Doctrine/Tests/Transport/ConnectionTest.php

@@ -328,6 +328,15 @@ public function testKeepalive()
             ->method('createQueryBuilder')
             ->willReturn($queryBuilder);
 
+        $queryBuilder->expects($this->once())
+            ->method('getSQL')
+            ->willReturn('UPDATE');
+
+        $driverConnection->expects($this->once())
+            ->method('executeStatement')
+            ->with('UPDATE')
+            ->willReturn(1);
+
         $driverConnection->expects($this->once())
             ->method('commit');
 
@@ -363,6 +372,10 @@ public function testKeepaliveRollback()
             ->method('createQueryBuilder')
             ->willReturn($queryBuilder);
 
+        $queryBuilder->expects($this->once())
+            ->method('getSQL')
+            ->willReturn('UPDATE');
+
         $driverConnection->expects($this->once())
             ->method('executeStatement')
             ->willThrowException($this->createMock(DBALException::class));