Using Font Awesome 6 instead of Font Awesome 5 for dunst

[Syphdias]

Hi, I'd like to use Font Awesome 6 instead of Font Awesome 5 for the dunst bell icons. I would be happy to open a PR and was wondering what would be the best way to do this.

Should I (a) replace 5 with 6 and call it a day, or (b) implement a font sector? (b.1) with v5 as default, or (b.2) with v6 as default?

If I should go for b. Is there a good example of how it should be done?