Updating the Google Login SDK to version 2.4.0 fixed ARC issues for me.
Now Google recommends using Cocoapod to manage SDK dependencies, so pod install Google or pod update Google worked for me. If you use only the Google Sign-In SDK, you can simply use the pod install Google/SignIn .
If you are not using Cocoapods, you can manually install the Sign-In SDK by downloading it from here and linking the binary to your project.
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