@john john Thank you for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.
- Yes, you need to upgrade your application to latest versions of specific runtime (.NET 8) once .NET 6 has reached to End of life.
- Your applications will continue to run but you won't be eligible for new features, security patches, and performance optimizations until you upgrade them to a supported language version.
- For more information, refer to this Language runtime support policy documentation.
Feel free to reach back to me if you have any further questions on this.