This release includes important improvements to complement Nixie's feature set:
- Added GracefulShutdown to terminate an actor after waiting for a delay to allow the pending messages in the actor's inbox to finish processing. This is done asynchronously.
- Added ScheduledShutdown to schedule the termination of an actor after a delay without waiting.
- Removed support for .NET 6 and 7 due to reliance on specific APIs of .NET 8.