Use PHP v8.4 for PHPStan and PHP_CodeSniffer tests

Author: fredden

.github/workflows/coding-standard.yml

@@ -17,4 +17,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: extdn/github-actions-m2/magento-coding-standard/8.1@master
+      - uses: extdn/github-actions-m2/magento-coding-standard/8.4@master

.github/workflows/phpstan.yml

@@ -17,6 +17,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: extdn/github-actions-m2/magento-phpstan/8.1@master
+      - uses: extdn/github-actions-m2/magento-phpstan/8.4@master
         with:
           composer_name: ethanyehuda/magento2-cronjobmanager