Suppressing deprecation warnings

[jbbeal]

A few updates:

• Upgrades @actions/core to 1.10.0 to remove deprecation warning (see https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/)
• Recompiling dist/index.js with @vercel/ncc (per https://docs.github.com/en/actions/creating-actions/creating-a-javascript-action#commit-tag-and-push-your-action-to-github)
• Fixing markdown syntax in README