Fixed phpstan conflict

Author: mateuszbieniek

phpstan-baseline.neon

@@ -60516,12 +60516,6 @@ parameters:
 			count: 1
 			path: tests/lib/Persistence/Cache/ContentHandlerTest.php
 
-		-
-			message: '#^Method Ibexa\\Tests\\Core\\Persistence\\Cache\\ContentHandlerTest\:\:testDeleteContent\(\) has no return type specified\.$#'
-			identifier: missingType.return
-			count: 1
-			path: tests/lib/Persistence/Cache/ContentHandlerTest.php
-
 		-
 			message: '#^Method Ibexa\\Tests\\Core\\Persistence\\Cache\\ContentLanguageHandlerTest\:\:providerForCachedLoadMethodsHit\(\) return type has no value type specified in iterable type array\.$#'
 			identifier: missingType.iterableValue