Update Auth imports

Author: ncooke3

FirebaseAuth/Sources/Swift/Auth/Auth.swift

@@ -19,10 +19,10 @@ import FirebaseAuthInterop
 import FirebaseCore
 import FirebaseCoreExtension
 #if COCOAPODS
-  @_implementationOnly import GoogleUtilities
+  internal import GoogleUtilities
 #else
-  @_implementationOnly import GoogleUtilities_AppDelegateSwizzler
-  @_implementationOnly import GoogleUtilities_Environment
+  internal import GoogleUtilities_AppDelegateSwizzler
+  internal import GoogleUtilities_Environment
 #endif
 
 #if os(iOS) || os(tvOS) || targetEnvironment(macCatalyst)

FirebaseAuth/Sources/Swift/MultiFactor/TOTP/TOTPSecret.swift

@@ -14,9 +14,9 @@
 
 import Foundation
 #if COCOAPODS
-  @_implementationOnly import GoogleUtilities
+  internal import GoogleUtilities
 #else
-  @_implementationOnly import GoogleUtilities_Environment
+  internal import GoogleUtilities_Environment
 #endif
 
 #if os(iOS)

FirebaseAuth/Sources/Swift/SystemService/AuthAPNSTokenManager.swift

@@ -17,9 +17,9 @@
   import UIKit
 
   #if COCOAPODS
-    @_implementationOnly import GoogleUtilities
+    internal import GoogleUtilities
   #else
-    @_implementationOnly import GoogleUtilities_Environment
+    internal import GoogleUtilities_Environment
   #endif // COCOAPODS
 
   // Protocol to help with unit tests.

FirebaseAuth/Sources/Swift/Utilities/AuthDefaultUIDelegate.swift

@@ -17,9 +17,9 @@
   import Foundation
   import UIKit
   #if COCOAPODS
-    @_implementationOnly import GoogleUtilities
+    internal import GoogleUtilities
   #else
-    @_implementationOnly import GoogleUtilities_Environment
+    internal import GoogleUtilities_Environment
   #endif
 
   /// Class responsible for providing a default AuthUIDelegate.