Bump fonttools from 4.39.3 to 4.43.0

Bumps [fonttools](https://github.com/fonttools/fonttools) from 4.39.3 to 4.43.0.
- [Release notes](https://github.com/fonttools/fonttools/releases)
- [Changelog](https://github.com/fonttools/fonttools/blob/main/NEWS.rst)
- [Commits](https://github.com/fonttools/fonttools/compare/4.39.3...4.43.0)

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

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

requirements.txt

@@ -18,7 +18,7 @@ decorator==5.1.1
 defusedxml==0.7.1
 executing==1.2.0
 fastjsonschema==2.16.3
-fonttools==4.39.3
+fonttools==4.43.0
 fqdn==1.5.1
 gprMax==3.1.4
 h5py==3.8.0