Bump configobj from 5.0.8 to 5.0.9 in /docker/dxl (#34747)

Bumps [configobj](https://github.com/DiffSK/configobj) from 5.0.8 to 5.0.9.
- [Release notes](https://github.com/DiffSK/configobj/releases)
- [Changelog](https://github.com/DiffSK/configobj/blob/release/CHANGES.rst)
- [Commits](DiffSK/configobj@v5.0.8...v5.0.9)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>