adjust composer.json to be installable with October 3.1

Author: renickbuettner

composer.json

@@ -4,8 +4,7 @@
   "description": "Deep simple Matomo integration for OctoberCMS",
   "license": "MIT",
   "require": {
-    "php": ">=7.4",
-    "composer/installers": "~1.0",
+    "php": ">=8.0",
     "matomo/matomo-php-tracker": "^3.0.4",
     "visualappeal/matomo-php-api": "^1.6"
   },