[google_sign_is] Update iOS SDK to 8.0 (flutter#9081)

Updates the SDK version from 7.1 to 8.0, to pick up Firebase App Check support.

The breaking change in the SDK is because it dropped iOS 11 support, which this plugin already didn't support.

Fixes flutter/flutter#166967

## Pre-Review Checklist

[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.

Author: stuartmorgan-g

packages/google_sign_in/google_sign_in_ios/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 5.9.0
+
+* Updates Google Sign-In SDK to 8.0+.
+
 ## 5.8.1
 
 * Asserts that new `forceAccountName` parameter is null (not used in iOS).

packages/google_sign_in/google_sign_in_ios/darwin/google_sign_in_ios.podspec

@@ -20,7 +20,7 @@ Enables Google Sign-In in Flutter apps.
   # Depend on versions which defines modules.
   s.dependency 'AppAuth', '>= 1.7.4'
   s.dependency 'GTMSessionFetcher', '>= 3.4.0'
-  s.dependency 'GoogleSignIn', '~> 7.1'
+  s.dependency 'GoogleSignIn', '~> 8.0'
   s.static_framework = true
   s.ios.dependency 'Flutter'
   s.osx.dependency 'FlutterMacOS'

packages/google_sign_in/google_sign_in_ios/darwin/google_sign_in_ios/Package.swift

@@ -18,7 +18,7 @@ let package = Package(
   dependencies: [
     .package(
       url: "https://github.com/google/GoogleSignIn-iOS.git",
-      from: "7.1.0")
+      from: "8.0.0")
   ],
   targets: [
     .target(

packages/google_sign_in/google_sign_in_ios/pubspec.yaml

@@ -2,7 +2,7 @@ name: google_sign_in_ios
 description: iOS implementation of the google_sign_in plugin.
 repository: https://github.com/flutter/packages/tree/main/packages/google_sign_in/google_sign_in_ios
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+google_sign_in%22
-version: 5.8.1
+version: 5.9.0
 
 environment:
   sdk: ^3.4.0