Fix GitHub Action deprecated notices.

[desrosj]

This fixes several deprecated notices caused by the use of set-output and save-output in GitHub Action workflows.

These were deprecated, and could be removed at any time without notice. GitHub posted an update on July 24th that they still plan on removing these commands but were delaying the removal because of continued high usage.

More can be found about this in the announcement posts:

• https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
• https://github.blog/changelog/2023-07-24-github-actions-update-on-save-state-and-set-output-commands/