Bump fonttools from 4.39.3 to 4.43.0 in /python/requirements

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](fonttools/fonttools@4.39.3...4.43.0)

---
updated-dependencies:
- dependency-name: fonttools
  dependency-type: indirect
...

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

python/requirements/examples.txt

@@ -40,7 +40,7 @@ entrypoints==0.4
     # via altair
 executing==1.2.0
     # via stack-data
-fonttools==4.39.3
+fonttools==4.43.0
     # via matplotlib
 idna==3.4
     # via requests