Lock dbal to 2.11.x to avoid LSP conflict

Author: KorvinSzanto

composer.json

@@ -21,7 +21,8 @@
     "composer/installers": "^1.3",
     "concrete5/core": "^8.2",
     "concrete5/dependency-patches": "^1.4.0",
-    "vlucas/phpdotenv": "^2.4"
+    "vlucas/phpdotenv": "^2.4",
+    "doctrine/dbal": "~2.11.0"
   },
   "require-dev": {
     "phpunit/phpunit": "~4.3|^8.0",