support .NET 7

[mrmartan]

Analogically to #172

[guibranco]

and .NET 8 and .NET 9 now...

[bruno-garcia]

It should work fine on .NET 7, 8 and 9. Are you suggesting that because there's no direct net9.0 on the project?

Sentry's fork had some changes but it's not redistributed as a standalone package. Only shipped part of the Sentry SDK itself.