Updated github actions to php 8.1

Author: sebprt

.github/workflows/actions.yml

@@ -17,7 +17,7 @@ jobs:
             - uses: actions/checkout@v2
             - uses: shivammathur/setup-php@v2
               with:
-                  php-version: '8.0'
+                  php-version: '8.1'
                   tools: composer:v2
                   coverage: pcov
             - uses: actions/cache@v2
@@ -29,7 +29,7 @@ jobs:
             - uses: php-actions/composer@v5
               with:
                   args: --prefer-dist
-                  php_version: 8.0
+                  php_version: 8.1
 
             - name: Run tests & generate Coverage
               run: bin/phpunit tests --coverage-html var/coverage --whitelist=src
@@ -55,7 +55,7 @@ jobs:
             -   uses: php-actions/composer@v5
                 with:
                     args: --prefer-dist
-                    php_version: 8.0
+                    php_version: 8.1
 
             -   name: PHPStan
                 uses: php-actions/phpstan@v2