Declare compatibility with PHP ^8.0 (#40)

PHP 8.3 is out and this package works fine with it, but the composer version still prevent to install it with PHP > 8.1.

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php-version: [ '7.2', '7.4', '8.1' ]
+                php-version: [ '7.2', '7.4', '8.1', '8.2', '8.3', '8.4' ]
                 dependency-version: [ prefer-stable ]
                 include:
                     - { php-version: '7.2', dependency-version: prefer-lowest }

composer.json

@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": "^7.2|8.0.*|8.1.*",
+        "php": "^7.2|^8.0",
         "doctrine/annotations": "^1.8",
         "doctrine/cache": "^1.9.1",
         "doctrine/common": "^2.11|^3.0",