Bump php version to 8.1

Author: sebastianfeldmann

.github/workflows/integration.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        php: ['8.0', '8.1', '8.2', '8.3', '8.4']
+        php: ['8.1', '8.2', '8.3', '8.4']
     steps:
     - uses: actions/checkout@master
 

composer.json

@@ -44,7 +44,7 @@
     }
   },
   "require": {
-    "php": ">=8.0",
+    "php": ">=8.1",
     "ext-dom": "*",
     "ext-json": "*",
     "ext-spl": "*",