Fix phpstan errors

Author: enumag

composer.json

@@ -20,6 +20,7 @@
     },
     "require-dev": {
         "nette/application": "^3.0.0@alpha",
+        "nette/caching": "^3.0.0@alpha",
         "latte/latte": "^3.0.0@alpha",
         "tracy/tracy": "^2.4.0"
     },

phpstan.neon

@@ -7,6 +7,5 @@ parameters:
         - %rootDir%/../../../tests/_*
 
     ignoreErrors:
-        - '#^Calling method getContent\(\) on possibly nullable type Symfony\\Component\\BrowserKit\\Response\|null#'
+        - '#^Calling method getContent\(\) on possibly null value of type Symfony\\Component\\BrowserKit\\Response\|null#'
         - '#^Method Arachne\\Codeception\\Module\\NetteDIModule::getContainer\(\) should return Nette\\DI\\Container but returns Nette\\DI\\Container\|null#'
-        - '#^Calling method [a-zA-Z]++\(\) on possibly nullable type Nette\\DI\\Container\|null#'