v5.0.0 MediaElement: .NET 9 support

Breaking Changes

Major Breaking Changes

• .NET 8 no longer supported
• Xcode 16.1 Required
• Increase minimum supported OS versions of CommunityToolkit.Maui.MediaElement
  • Android 26.0
  • iOS 15.0
  • MacCatalyst 15.0

What's Changed

• Support .NET 9.0 by @bijington in #2215
• [BUG] .Net 9 Android MediaElement stops playing video

Full Changelog: 2.0.4-maps...5.0.0-mediaelement