Prevent application crashes from MAUI ScreenshotImplementation

[jamescrosswell]

Partially addresses #3880.

See:

• iOS app crash when use AttachScreenshot=true #3880 (comment)

[thisisthekap]

@jamescrosswell Are you able to provide an ETA when this is going to be published?

[jamescrosswell]

@thisisthekap this is out now:
https://github.com/getsentry/sentry-dotnet/blob/main/CHANGELOG.md#550

[thisisthekap]

@jamescrosswell Thank you!