Add support for symfony 7.1 (#8)

* Add support for symfony 7.1
* Drop 4.4 support

Author: kimpepper

Diff for: composer.json

@@ -9,16 +9,16 @@
     }
   ],
   "require": {
-    "php": "^8.1|^8.2",
+    "php": "^8.1",
     "ext-json": "*",
-    "symfony/property-access": "^4.4|^5.4|^6.2",
-    "symfony/serializer": "^4.4|^5.4|^6.2"
+    "symfony/property-access": "^5.4|^6.2|^7.1",
+    "symfony/serializer": "^5.4|^6.2|^7.1"
   },
   "require-dev": {
     "drupal/coder": "^8.3.16",
     "phpunit/phpunit": "^9.5.28",
     "phpspec/prophecy": "^1.16",
-    "symfony/phpunit-bridge": "^5.4"
+    "symfony/phpunit-bridge": "^5.4|^6.2|^7.1"
   },
   "autoload": {
     "psr-4": {"PNX\\Prometheus\\": "src/"}