Minor fixes:
- fixed readme code sample, #4667
- build: fix .net8 target while publishing artifacts, #4680
- Fix GenerateNSwagTypeScript target, #4687
- Fix missing assignment of base URL, #4691
- Disable warning CS8625 "Cannot convert null literal to non-nullable reference type." in generated code, #4656
- Fix generated C# clients using base URL, #4674