Drop support for PHP 8.1 and 8.2; update minimum PHP version to 8.3 in composer.json

Author: byjg

.github/workflows/phpunit.yml

@@ -21,8 +21,6 @@ jobs:
           - "8.5"
           - "8.4"
           - "8.3"
-          - "8.2"
-          - "8.1"
 
     env:
       MEMCACHED_SERVER: "memcached:11211"

composer.json

@@ -12,7 +12,7 @@
     }
   },
   "require": {
-    "php": ">=8.1 <8.6",
+    "php": ">=8.3 <8.6",
     "psr/cache": "^1.0|^2.0|^3.0",
     "psr/log": "^1.0|^2.0|^3.0",
     "psr/simple-cache": "^1.0|^2.0",