Usage of query for older NC instances

Signed-off-by: Christian Wolf <github@christianwolf.email>

Author: christianlupus

tests/Integration/Setup/Migrations/Version000000Date20210701093123Test.php

@@ -47,7 +47,7 @@ public function setUp(): void {
 		$schema = $this->container->query(SchemaWrapper::class);
 		$this->assertIsObject($schema);
 
-		$connection = \OC::$server->get(Connection::class);
+		$connection = \OC::$server->query(Connection::class);
 		$this->migrationService = new MigrationService('cookbook', $connection);
 
 		// undo all migrations of cookbook app