Do not use unsupported folded chomping multiline YAML block syntax

[AetherUnbound]

Description

This is a follow-up to #3657 - apparently the folded block syntax > is not supported on GitHub Actions.

I observed this in #3699 due to this failed run: https://github.com/WordPress/openverse/actions/runs/7634210058/job/20797766111?pr=3699 (I don't think we had a run since merging #3657 that pinged someone yet).

Testing Instructions

We can't test this, but since it's just concatenating into one big line, hopefully it should just work.

Checklist

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• I ran the DAG documentation generator (if applicable).

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[dhruvkb]

LGTM and TIL!