[1.x] Require php 8.1 (#419)

* chore(deps): require php 8.1

* fix(ci): use php 8.1

Author: imdhemy

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         operating-system: [ ubuntu-latest, windows-latest, macos-latest ]
-        php-version: [ 8.0, 8.3 ]
+        php-version: [ 8.1, 8.3 ]
     steps:
 
       # --------- Setup steps ---------

composer.json

@@ -17,7 +17,7 @@
     }
   ],
   "require": {
-    "php": ">=8.0",
+    "php": ">=8.1",
     "ext-json": "*",
     "ext-openssl": "*",
     "imdhemy/appstore-iap": "^1.6",
@@ -63,7 +63,7 @@
     "sort-packages": true,
     "allow-plugins": {},
     "platform": {
-      "php": "8.0"
+      "php": "8.1"
     }
   }
 }