Fixed the Discord webhooks again :D
Switched from that gmsv_steamhttp module to gmsv_chttp which is based on cURL instead of the SteamHTTP API.
Please note that gmsv_steamhttp crashed servers where Steam wasn't logged in on the machine, so it is highly recommended that you uninstall gmsv_steamhttp and update this script.
gmsv_chttp has a harder installation process but doesn't crash the server.
You can read how to use it here: https://www.gmodstore.com/help/addon/6016/discord/curl-http