PHPCS: use PHP-Code-Style 2.0

* Composer: require `php-parallel-lint/php-code-style` at 2.0 or higher.
* Composer: remove the requirement for PHPCS. This will now be inherited from the code style repo.
* GH Actions, test workflow: adjust the removal of the PHPCS dependency to match.

Author: jrfnl

.github/workflows/test.yml

@@ -40,10 +40,10 @@ jobs:
           coverage: none
           tools: cs2pr
 
-      # Remove PHPCS as it has a minimum PHP requirements of PHP 5.4 and would block install on PHP 5.3.
+      # Remove the PHPCS standard as it has a minimum PHP requirements of PHP 5.4 and would block install on PHP 5.3.
       - name: 'Composer: remove PHPCS'
         if: ${{ matrix.php < 5.4 }}
-        run: composer remove --dev squizlabs/php_codesniffer --no-update
+        run: composer remove --dev php-parallel-lint/php-code-style --no-update
 
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-composer-dependencies

composer.json

@@ -21,8 +21,7 @@
         "phpunit/phpunit": "^4.8.36 || ^5.7.21 || ^6.0 || ^7.0 || ^8.0 || ^9.0",
         "php-parallel-lint/php-parallel-lint": "^1.0",
         "php-parallel-lint/php-var-dump-check": "0.*",
-        "squizlabs/php_codesniffer": "3.*",
-        "php-parallel-lint/php-code-style": "1.0"
+        "php-parallel-lint/php-code-style": "^2.0"
     },
     "replace": {
         "jakub-onderka/php-console-color": "*"