Update PHP version in workflows

.github/workflows/phpcs.yml

@@ -25,11 +25,11 @@ jobs:
         uses: php-actions/composer@v6
         with:
           command: update
-          php_version: "8.0"
+          php_version: "8.1"
 
       - name: Run PHPCS
         uses: php-actions/phpcs@v1
         with:
-          php_version: "8.0"
+          php_version: "8.1"
           path: src/
           standard: phpcs.xml.dist

.github/workflows/phpmd.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Setup Environment
         uses: shivammathur/setup-php@v2
         with:
-          php-version: "8.0"
+          php-version: "8.1"
           coverage: none
           tools: phpmd
 

.github/workflows/phpstan.yml

@@ -26,7 +26,7 @@ jobs:
         uses: php-actions/composer@v6
         with:
           command: update
-          php_version: "8.0"
+          php_version: "8.1"
 
       - name: Run PHPStan
         uses: php-actions/phpstan@v3