Bump afdko from 3.9.1 to 4.0.0

Bumps [afdko](https://github.com/adobe-type-tools/afdko) from 3.9.1 to 4.0.0.
- [Release notes](https://github.com/adobe-type-tools/afdko/releases)
- [Changelog](https://github.com/adobe-type-tools/afdko/blob/develop/NEWS.md)
- [Commits](adobe-type-tools/afdko@3.9.1...4.0.0)

---
updated-dependencies:
- dependency-name: afdko
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements.txt

@@ -1,4 +1,4 @@
-afdko==3.9.1
+afdko==4.0.0
 appdirs==1.4.4
 attrs==21.4.0
 black==22.6.0