Deps: Bump the dependencies group

Bumps the dependencies group in /backport-pull-request with 2 updates: [pontos](https://github.com/greenbone/pontos) and [platformdirs](https://github.com/platformdirs/platformdirs).


Updates `pontos` from 24.3.2 to 24.9.0
- [Release notes](https://github.com/greenbone/pontos/releases)
- [Commits](greenbone/pontos@v24.3.2...v24.9.0)

Updates `platformdirs` from 4.2.2 to 4.3.2
- [Release notes](https://github.com/platformdirs/platformdirs/releases)
- [Changelog](https://github.com/tox-dev/platformdirs/blob/main/CHANGES.rst)
- [Commits](tox-dev/platformdirs@4.2.2...4.3.2)

---
updated-dependencies:
- dependency-name: pontos
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
- dependency-name: platformdirs
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

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