Pin docker/dind to 24.0.6 to fix CI

[jamesrkiger]

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. 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

Fixes an issue with Docker images that cause GitLab CI to fail on the 'build' step.

Notes

Same fix for docker image as we made here for KPI.

[LMNTL]

Great, thank you! One request before I merge: would you mind adding a comment like this above the image: docker line? You can copy-paste it or write your own, I just want to make sure that the next person who has to modify this file knows to revert this change when the issue's resolved.