MNT Update release dependencies

Author: emteknetnz

composer.json

@@ -5,11 +5,11 @@
     "license": "BSD-3-Clause",
     "require": {
         "php": "^8.1",
-        "silverstripe/recipe-plugin": "2.1.x-dev",
-        "silverstripe/vendor-plugin": "2.1.x-dev",
-        "silverstripe/recipe-cms": "5.4.x-dev",
-        "silverstripe-themes/simple": "3.3.x-dev",
-        "silverstripe/login-forms": "5.3.x-dev"
+        "silverstripe/recipe-plugin": "~2.1.0@stable",
+        "silverstripe/vendor-plugin": "~2.1.0@stable",
+        "silverstripe/recipe-cms": "~5.4.0@stable",
+        "silverstripe-themes/simple": "~3.3.2@stable",
+        "silverstripe/login-forms": "~5.3.0@stable"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.6"