The Google Maps iOS SDK dependency does not yet support ARM iOS simulators https://developers.google.com/maps/faq#demoappxcode12
Internal bug: b/171267982

But their podspec doesn't contain 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'arm64' https://github.com/CocoaPods/Specs/blob/master/Specs/a/d/d/GoogleMaps/5.1.0/GoogleMaps.podspec.json

Set it in google_maps_flutter.podspec instead until they do support it.

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

See #85713 (comment)