Update actions/download-artifact digest to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/download-artifact	action	digest	e9ef242 -> f44cd7b

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[ernestognw]

I upgraded to v4 since actions/download-artifact#194 was released until the v4 tag.
I checked their MIGRATION.md guide and seems we're fine because we're not uploading multiple files in the same run.