go-fsnotify/fsnotify was the original name of this project. The project organization was renamed from go-fsnotify to fsnotify some time ago, meaning Github created a silent redirect to the new organization name. This behavior is dangerous since it allows anyone to register the go-fsnotify account and create a fsnotify repository, which will eventually be pulled by projects that have dependencies to it. Dependency squatting can remain undetected for a long period of time because Github silently redirects git pulls, reducing breakage.
Change your dependencies from github.com/go-fsnotify/fsnotify to github.com/fsnotify/fsnotify