Bump fonttools from 4.42.0 to 4.43.0

Bumps [fonttools](https://github.com/fonttools/fonttools) from 4.42.0 to 4.43.0.
- [Release notes](https://github.com/fonttools/fonttools/releases)
- [Changelog](https://github.com/fonttools/fonttools/blob/main/NEWS.rst)
- [Commits](fonttools/fonttools@4.42.0...4.43.0)

---
updated-dependencies:
- dependency-name: fonttools
  dependency-type: direct:production
...

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

requirements.txt

@@ -39,7 +39,7 @@ docutils==0.20.1
     # via
     #   rst2pdf (setup.py)
     #   sphinx
-fonttools==4.42.0
+fonttools==4.43.0
     # via matplotlib
 html5lib==1.1
     # via xhtml2pdf