Bump fonttools from 4.42.1 to 4.43.0 in /server

Bumps [fonttools](https://github.com/fonttools/fonttools) from 4.42.1 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@4.42.1...4.43.0)

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

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

server/requirements.txt

@@ -41,7 +41,7 @@ flask-login==0.6.2
     # via -r requirements.in
 flask-wtf==1.1.1
     # via -r requirements.in
-fonttools==4.42.1
+fonttools==4.43.0
     # via matplotlib
 html5lib==1.1
     # via astroquery