Drop support for php < 8.1

Author: pgrimaud

.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
       - name: "Setup PHP"
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.0'
+          php-version: '8.1'
           tools: composer
 
       - name: "Install dependencies"