.NET July 2026 Updates (release-6.18)

Release a new version of ServiceControl including the runtime from the [.NET July 2026 Updates
](https://github.com/dotnet/announcements/issues/425).

There are no code changes. The new .NET Runtime is included as part of the build process.

See the [.NET Update issue](https://github.com/dotnet/announcements/issues/425) for details of what was included in the .NET release.