Update composer.json

Co-Authored-By: fitztrev <[email protected]>

Author: PowerKiKi

composer.json

@@ -21,7 +21,7 @@
     }
   },
   "require": {
-    "sabberworm/php-css-parser": "8.3.*"
+    "sabberworm/php-css-parser": "^8.3"
   },
   "require-dev": {
     "phpunit/phpunit": "^5.5|^6.5"