Replace `gorilla/mux`

[matrixbot]

This issue was originally created by @S7evinK at https://github.com/matrix-org/dendrite/issues/3017.

Since gorilla/mux is archived and not actively maintained, we should replace it with a different router/mux.

Possible replacements:

• https://github.com/julienschmidt/httprouter
• https://github.com/go-chi/chi
• https://github.com/labstack/echo
• other?

[matrixbot]

This comment was originally posted by @joy4eg at https://github.com/matrix-org/dendrite/issues/3017#issuecomment-1489902389.

I would recommend considering also https://github.com/gofiber/fiber

[matrixbot]

This comment was originally posted by @S7evinK at https://github.com/matrix-org/dendrite/issues/3017#issuecomment-1490961996.

We've decided to go with https://github.com/julienschmidt/httprouter, as we don't need many of the features provided by other routers.

[matrixbot]

This comment was originally posted by @S7evinK at https://github.com/matrix-org/dendrite/issues/3017#issuecomment-1638718515.

https://gorilla.github.io/blog/2023-07-17-project-status-update/ Given this, closing.