Version 8.0

What's Changed

• Switch to .NET 8 (.NET 6 and 7 are still supported) by @Kaliumhexacyanoferrat in #420
• Stop handling new requests after the server has been stopped by @Kaliumhexacyanoferrat in #416
• Respond with HTTP 400 if the request body cannot be deserialized by @Kaliumhexacyanoferrat in #417
• Make Sonar analysis warning free by @Kaliumhexacyanoferrat in #419

Full Changelog: v7.0.0...v8.0.0