Mark google_sign_in as not supporting arm64 iOS simulators

[jmagman]

The GoogleSignIn iOS SDK dependency pre-6.0 did not support ARM iOS simulators.

But their podspec didn't contain 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'arm64' https://github.com/CocoaPods/Specs/blob/master/Specs/d/4/0/GoogleSignIn/5.0.2/GoogleSignIn.podspec.json

Set it in google_sign_in.podspec instead until it can adopt 6.0, which does support it.

  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'arm64' }

#85713 (comment)

[github-actions]

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