Update FontAwesome from 6.7.1 to 6.7.2. (#949)

### Prerequisites

Put an `x` into the box(es) that apply:

- [x] This pull request fixes a bug.
- [ ] This pull request adds a feature.
- [ ] This pull request introduces breaking change.

### Description

Bugfix release of FontAwesome. Files unpacked (unmodified) from the
release archive on their website.

This drastically reduces the CSS size compared to the prior releases in
the 6.7 branch due to the removal of the broken (non-free) duotone code
generated from the SCSS.

https://fontawesome.com/changelog

### Issues Resolved

None

### Checklist

Put an `x` into the box(es) that apply:

#### General

- [x] Describe what changes are being made
- [x] Explain why and how the changes were necessary and implemented
respectively
- [ ] Reference issue with `#<ISSUE_NO>` if applicable

#### Resources

- [x] If you have changed any SCSS code, run `make release` to
regenerate all CSS files

#### Contributors

- [ ] Add yourself to `CONTRIBUTORS.md` if you aren't on it already

Co-authored-by: Luiz F. A. de Prá <luizdepra@users.noreply.github.com>