[release/7.0.1xx-preview7] Update dependencies from xamarin/xamarin-macios

[dotnet-maestro[bot]]

This pull request updates the following dependencies

From https://github.com/xamarin/xamarin-macios

• Subscription: fa80628f-9f14-4e50-85b6-08da7018f853
• Build: 20220728.8
• Date Produced: July 28, 2022 10:22:32 PM UTC
• Commit: d362375d3f7cb1aa9cc6de3f8f14ab0c09531cda
• Branch: refs/heads/release/7.0.1xx-preview7

• Updates:
  • Microsoft.iOS.Sdk: from 15.4.907-preview.7 to 15.4.908-preview.7
  • Microsoft.MacCatalyst.Sdk: from 15.4.907-preview.7 to 15.4.908-preview.7
  • Microsoft.macOS.Sdk: from 12.3.907-preview.7 to 12.3.908-preview.7
  • Microsoft.tvOS.Sdk: from 15.4.907-preview.7 to 15.4.908-preview.7