GitHub deploy actions require updates

[kevinfalting]

After the latest deploy, there were some warnings.

• Check and Deploy: Node.js 12 actions are deprecated. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/. Please update the following actions to use Node.js 16: actions/checkout@v2, slackapi/[email protected]
• Check and Deploy: The set-output command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Let's see what we can do to resolve them. 👍

[alok-38]

This issue looks interesting to me. Please guide me on how to update GitHub actions to use Node.js 16.