While updating fyne I had to download gl too and while trying to use this command go get github.com/go-gl/gl/v2.1/gl all it shows is:
go: module github.com/go-gl/gl@upgrade found (v0.0.0-20231021071112-07e5d0ea2e71), but does not contain package github.com/go-gl/gl/v2.1/gl