chore: fix CI4 version to 4.5.*

Author: kenjis

composer.json

@@ -22,8 +22,8 @@
     "slack": "https://codeigniterchat.slack.com"
   },
   "require": {
-    "php": "^7.4 || ^8.0",
-    "codeigniter4/framework": "^4.3"
+    "php": "^8.1",
+    "codeigniter4/framework": "4.5.*"
   },
   "require-dev": {
     "phpunit/phpunit": "^9.3",