[iOS] Update to support Firebase SDK v7

[khlau10]

I have tried to use this plugin together with admob-plus and encountered the following error when pod install --verbose

[!] CocoaPods could not find compatible versions for pod "GoogleUtilities/Environment":
  In snapshot (Podfile.lock):
    GoogleUtilities/Environment (= 7.1.1)

  In Podfile:
    Firebase/Auth (= 6.33.0) was resolved to 6.33.0, which depends on
      FirebaseAuth (~> 6.9.2) was resolved to 6.9.2, which depends on
        GoogleUtilities/Environment (~> 6.7)

    Google-Mobile-Ads-SDK (~> 7.68) was resolved to 7.68.0, which depends on
      GoogleAppMeasurement (~> 7.0) was resolved to 7.1.0, which depends on
        GoogleUtilities/AppDelegateSwizzler (~> 7.0) was resolved to 7.1.1, which depends on
          GoogleUtilities/Environment (= 7.1.1)

I believe this is similar to this issue but this time around it is to up it to version 7.
Any plan for upgrading this and what's your suggestion for the workaround for now ?

[faytekin]

+1

[FatManiac]

@dpa99c Hi, the firebase plugin will be updated someday or be updatable for ios ?

[kosbar]

+1

[dpa99c]

Resolved in the major version release [email protected] which updates to Firebase iOS SDK v7