Deprecated Node.js version for `autolabel` action

[dbeatty10]

autolabel
The following actions use a deprecated Node.js version and will be forced to run on node20: actions/labeler@v4. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Example: https://github.com/dbt-labs/hub.getdbt.com/actions/runs/11842514224