Update cakephp version number

Author: markstory

composer.json

@@ -6,7 +6,7 @@
     "license": "MIT",
     "require": {
         "php": ">=7.4",
-        "cakephp/cakephp": "dev-4.next as 4.5.0",
+        "cakephp/cakephp": "^4.5.0-RC1",
         "cakephp/migrations": "^3.7",
         "cakephp/plugin-installer": "^1.3",
         "mobiledetect/mobiledetectlib": "^3.74"