v2.0: .NET 8 & iOS 17 support

This version now targets .NET 8 because we need new APIs from iOS 17. That also means: this version supports the new iOS 17 APIs for accessing calendars. Check out the updated README for new permissions declarations that need to be added.

What's Changed

• Bump to .NET 8 & Fix up APIs for Xcode 15/iOS 17 by @jfversluis in #46
• Add new iOS 17 permission info to README by @jfversluis in #50

Full Changelog: v1.0.2...v2.0.0