Node.js 12 and set-output deprecation warnings

[zehnm]

I'd love to continue using this GitHub action, but I'm getting these warnings for a while:

Node.js 12 actions are deprecated. Please update the following actions to use Node.js 16: mbowman100/swagger-validator-action@master. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/

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/

Is this project still maintained?