Please support Ruby 4.x


```sh
 gem install filewatcher-spinner
ERROR:  Error installing filewatcher-spinner:
        filewatcher-spinner-1.0.0 requires Ruby version >= 2.6, < 4. The current ruby version is 4.0.1.
```


https://github.com/filewatcher/filewatcher-spinner/blob/be3322c56813fdebaa3196f73687f5a9943ba08f/filewatcher-spinner.gemspec#L33