MNT Revert erroneous dependency changes (#77)

Author: GuySartorelli

composer.json

@@ -15,7 +15,7 @@
     ],
     "require": {
         "php": "^7.4 || ^8.0",
-        "silverstripe/cms": "4.13.x-dev"
+        "silverstripe/cms": "^4"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5",