Remove unused jakub-onderka/php-parallel-lint

Signed-off-by: Daniel Kesselberg <mail@danielkesselberg.de>

composer.json

@@ -16,8 +16,6 @@
         "ext-pdo": "*"
     },
     "require-dev": {
-        "jakub-onderka/php-parallel-lint": "^0.9.2",
-        "jakub-onderka/php-console-highlighter": "^0.3.2",
         "nextcloud/coding-standard": "^0.3.0"
     },
     "scripts": {