Update mockServiceWorker.js to version 2.6.5

- Bumped PACKAGE_VERSION from 2.6.4 to 2.6.5.
- Ensure the latest version is used for development and testing purposes.
- Reminder:

public/mockServiceWorker.js

@@ -8,7 +8,7 @@
  * - Please do NOT serve this file on production.
  */
 
-const PACKAGE_VERSION = '2.6.4'
+const PACKAGE_VERSION = '2.6.5'
 const INTEGRITY_CHECKSUM = 'ca7800994cc8bfb5eb961e037c877074'
 const IS_MOCKED_RESPONSE = Symbol('isMockedResponse')
 const activeClientIds = new Set()