Add kwarg 'child' required by seriaizers.ListField

[dhruvkb]

This PR fixes a missing keyword argument in ListField which gives warnings or errors in CI. This was contributed in several PRs

• Add sentry #411
• Setup Sphinx for developer-docs #427
• Reuse images across jobs #429

so merging it separately while removing it from the PRs would prevent them from "eventually conflicting".

Description

serializers.ListField requires that the child-field be passed as a keyword argument 'child' and not as a positional argument. This requirement is addressed by the PR.

Testing Instructions

Passing CI is sufficient.

Checklist

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• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[AetherUnbound]

Looks good! Thanks for making this a separate PR