Bump min PHP version to 8.1

Author: fabpot

composer.json

@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "php": ">=8.0.2",
+        "php": ">=8.1.0",
         "symfony/cache": "^5.4|^6.4|^7.0",
         "twig/twig": "^3.19|^4.0"
     },