Add explicit support for PHP 8.1

Author: marcelthole

.github/workflows/build.yml

@@ -23,6 +23,10 @@ jobs:
             composer-deps: lowest
           - php-version: "8.0"
             composer-deps: latest
+          - php-version: "8.1"
+            composer-deps: lowest
+          - php-version: "8.1"
+            composer-deps: latest
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v2"

composer.json

@@ -14,7 +14,7 @@
     }
   ],
   "require": {
-    "php": "^7.4 || ~8.0.0",
+    "php": "^7.4 || ~8.0.0 || ~8.1.0",
     "cebe/php-openapi": "^1.5.2",
     "symfony/console": "^v5.1.9"
   },