Bump fonttools from 4.27.1 to 4.28.1

Bumps [fonttools](https://github.com/fonttools/fonttools) from 4.27.1 to 4.28.1.
- [Release notes](https://github.com/fonttools/fonttools/releases)
- [Changelog](https://github.com/fonttools/fonttools/blob/main/NEWS.rst)
- [Commits](fonttools/fonttools@4.27.1...4.28.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -4,4 +4,4 @@
 #
 #    pip-compile
 #
-fonttools==4.27.1         # via dehinter (setup.py)
+fonttools==4.28.1         # via dehinter (setup.py)