Bump black from 24.4.2 to 24.10.0 in /backend

Bumps [black](https://github.com/psf/black) from 24.4.2 to 24.10.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@24.4.2...24.10.0)

---
updated-dependencies:
- dependency-name: black
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

backend/requirements.txt

@@ -1,5 +1,5 @@
 astroid==3.1.0
-black==24.4.2
+black==24.10.0
 click==8.1.7
 dill==0.3.8
 Flask==3.0.3