Apply suggestions from code review

Author: paulbalandan

admin/prepare-release.php

@@ -80,7 +80,7 @@ function replace_file_content(string $path, string $pattern, string $replace): v
 replace_file_content(
     './admin/starter/builds',
     '/define\(\'NEXT_MINOR\', \'.*?\'\);/mu',
-    "define('NEXT_MINOR', '{$nextMinor}-dev');",
+    "define('NEXT_MINOR', '^{$nextMinor}-dev');",
 );
 
 // Commits

admin/starter/builds

@@ -3,7 +3,7 @@
 
 define('LATEST_RELEASE', '^4.7');
 define('DEVELOP_BRANCH', 'dev-develop');
-define('NEXT_MINOR', '4.8-dev');
+define('NEXT_MINOR', '^4.8-dev');
 define('GITHUB_URL', 'https://github.com/codeigniter4/codeigniter4');
 
 /*