Used libraries `gorilla/mux` and `gorilla/handlers` became archived

[JakobMiksch]

The libraries https://github.com/gorilla/mux and https://github.com/gorilla/handlers became archived. It would be good to replace them at one point.

• related https://github.com/CrunchyData/pg_featureserv/issues/136

[pramsey]

Events continue apace: https://gorilla.github.io/blog/2023-07-17-project-status-update/

[JakobMiksch]

Great news! In this case we can close the issue, if you agree.