minor #240 Upgrade php-cs-fixer used in gh action and run on php 8 (kbond)

This PR was merged into the 2.x branch.

Discussion
----------

Upgrade php-cs-fixer used in gh action and run on php 8

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Tickets       | n/a
| License       | MIT

Currently, php-cs-fixer doesn't like the php 8 syntax (ie unions/promoted properties) we'd like to use in twig/live components.

Commits
-------

0f34080 upgrade php-cs-fixer used in gh action and run on php 8

Author: weaverryan

.github/workflows/test.yaml

@@ -9,11 +9,10 @@ jobs:
             - uses: actions/checkout@master
             - uses: shivammathur/setup-php@v2
               with:
-                  php-version: '7.4'
+                  php-version: '8.0'
+                  tools: php-cs-fixer, cs2pr
             - name: php-cs-fixer
-              run: |
-                  wget https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases/download/v2.18.2/php-cs-fixer.phar -q
-                  php php-cs-fixer.phar fix --dry-run --diff
+              run: php-cs-fixer fix --dry-run --format=checkstyle | cs2pr
 
     coding-style-js:
         runs-on: ubuntu-latest

.gitignore

@@ -1,4 +1,4 @@
-.php_cs.cache
+.php-cs-fixer.cache
 node_modules
 yarn.lock
 yarn-error.log

.php_cs.dist renamed to .php-cs-fixer.dist.php

@@ -4,7 +4,7 @@
     exit(0);
 }
 
-return PhpCsFixer\Config::create()
+return (new PhpCsFixer\Config())
     ->setRules([
         '@Symfony' => true,
         '@Symfony:risky' => true,