New WordPress core updates automatically re-installs some unnecessary files like wp-config-sample.php, read me files, and license files, both default and localized versions, whenever WordPress is updated.
Even though when you manually delete such files for security reasons, they are automatically downloaded during new updates. This get tedious for users running multiple WordPress sites. Here comes the use of WP Core Update Cleaner plugin.
The plugin automatically delete these files every time a WordPress site is updated.
Start by installing WP Core Update Cleaner plugin in WordPress
Once the plugin is activated it automatically does the work when downloading new WordPress core updates.