Replace deprecated set-output command

[krysal]

Fixes

Fixes WordPress/openverse#1327 by @krysal

Description

The PR replaces the command by writing to the environment file as suggested by GitHub.

Testing Instructions

Wait to see if the ci_cd.yml workflow passess.

Checklist

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[krysal]

Does anyone see the origin of the error thrown by actionlint? I don't get it locally.

[zackkrida]

Looks right; thanks!

[obulat]

LGTM! I have added similar changes to the frontend, but I used Python: https://github.com/WordPress/openverse-frontend/pull/1940/files