[iOS][auth] Firebase App Check support for Firebase Authentication (Update firebase authentication to >10.8.0)

[kanclalg]

https://firebase.google.com/support/release-notes/ios#version_1080_-_april_11_2023

In April firebase implemented app check support for firebase authentication product, but it's not working with current plugin because it was implemented on version 10.8.0 and currently this plugin uses pod 'Firebase/Auth', '~>10.7.0'. Are there any plans to update it soon?
I expect this to be quite important as more people would want to implement app check for authentication if they are using phone authentication because of changed authentication product pricing and fraudulent requests.