[shopsys] upgrade easy coding standards (#3192)

Author: grossmannmartin

.github/workflows/run-checks-tests.yaml

@@ -20,9 +20,5 @@ jobs:
                     tools: composer
             -   name: Install Composer dependencies
                 run: composer install --optimize-autoloader --no-interaction
-            -   name: Run parallel-lint
-                run: php vendor/bin/parallel-lint ./src ./tests
-            -   name: Run Easy Coding Standards
-                run: php vendor/bin/ecs check --verbose ./src ./tests
             -   name: Run PHPUnit
                 run: php vendor/bin/phpunit tests

composer.json

@@ -40,13 +40,11 @@
         "twig/twig": "^3.5.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5.20",
-        "shopsys/coding-standards": "15.0.x-dev"
+        "phpunit/phpunit": "^9.5.20"
     },
     "config": {
         "allow-plugins": {
-            "symfony/flex": true,
-            "dealerdirect/phpcodesniffer-composer-installer": true
+            "symfony/flex": true
         }
     }
 }