Upped the minimum-supported PHP version to PHP 8.1.

Author: hopeseekr

composer.json

@@ -14,19 +14,16 @@
         "issues": "https://github.com/sebastianbergmann/phploc/issues"
     },
     "config": {
-        "platform": {
-            "php": "7.3.0"
-        },
         "optimize-autoloader": true,
         "sort-packages": true
     },
     "require": {
-        "php": ">=7.3",
+        "php": ">=8.1",
         "ext-dom": "*",
         "ext-json": "*",
-        "sebastian/cli-parser": "^1.0",
-        "sebastian/version": "^3.0",
-        "phpunit/php-file-iterator": "^3.0"
+        "sebastian/cli-parser": "^2.0",
+        "sebastian/version": "^4.0",
+        "phpunit/php-file-iterator": "^4.0"
     },
     "autoload": {
         "classmap": [