Bump fonttools from 4.27.1 to 4.28.0

Bumps [fonttools](https://github.com/fonttools/fonttools) from 4.27.1 to 4.28.0.
- [Release notes](https://github.com/fonttools/fonttools/releases)
- [Changelog](https://github.com/fonttools/fonttools/blob/main/NEWS.rst)
- [Commits](fonttools/fonttools@4.27.1...4.28.0)

---
updated-dependencies:
- dependency-name: fonttools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -22,7 +22,7 @@ colorama==0.4.4
     # via rich
 commonmark==0.9.1
     # via rich
-fonttools==4.27.1
+fonttools==4.28.0
     # via fdiff (setup.py)
 idna==3.3
     # via yarl