Bump fonttools from 4.37.3 to 4.43.0 in /backend (#301)

* Bump fonttools from 4.37.3 to 4.43.0 in /backend

Bumps [fonttools](https://github.com/fonttools/fonttools) from 4.37.3 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@4.37.3...4.43.0)

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

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* Trigger CI

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Salomon Popp <salomon.popp@bakdata.com>