Include `font_features` in cache key for fonts (#8928)

## Release Notes

- Fixed font ligatures not always respecting the setting
([#4313](https://github.com/zed-industries/zed/issues/4313)).

## Preview


![20240306133121_rec_-convert](https://github.com/zed-industries/zed/assets/8667822/dc2aaa00-41d0-4fe9-8d9c-80e1f047894d)
105e654dceYesterday17 committed on 3/7/2024, 4:06:19 PM· committed by GitHubparent6b89842
1 file changedLine totals unavailable