Fix django-import-export dependencies

[jnm]

Checklist

1. If you've added code that should be tested, add tests
2. If you've changed APIs, update (or create!) the documentation
3. Ensure the tests pass
4. Run ./python-format.sh to make sure that your code lints and that you've followed our coding style
5. Write a title and, if necessary, a description of your work suitable for publishing in our release notes
6. Mention any related issues in this repository (as #ISSUE) and in other repositories (as kobotoolbox/other#ISSUE)
7. Open an issue in the docs if there are UI/UX changes

Description

For developers: fixes "ModuleNotFoundError: No module named 'tablib'" error that would occur when attempting to install Python dependencies for development.

Notes

Add subdependencies that were missing from #4986, presumably as a result of manually editing *requirements.txt files instead of running pip-compile.sh. The incomplete requirements files did not cause a problem with an initial pip-sync call, which allowed the subdependencies like tablib to remain, but future calls to pip-sync removed these subdependencies since they were missing from the *requirements.txt files. Internal discussion: https://chat.kobotoolbox.org/#narrow/stream/4-Kobo-Dev/topic/KPI.3A.20ModuleNotFoundError.3A.20No.20module.20named.20'tablib'

Related issues

Related to #4986

[Akuukis]

LGTM, repro:

1. ➡️ in a fresh kobo-install run ./run.py (FYI kpi main branch is at 2c0159859)
2. 🔴 notice a failing kpi container due missing tablib dependency
3. ➡️ in kpi git checkout this PR
4. ➡️ in kobo-install run ./run.py -cf build kpi --no-cache --force-rm
5. ➡️ in kobo-install run ./run.py
6. 🟢 notice a working kpi container