Update action to account for deprecations

[martinthomson]

nodejs update: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/

save-state and set-output commands: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/