`set-output` is deprecated

[JoanFM]

Hello @Ana06,

First of all, thanks for this awesome Action, we are using it actively.

We realized that Github Actions is going to deprecate some features used by your action, so I would like to know if you could adapt to theuir proposed changes.

Check:

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

I would open a PR, but I have little experience with JavaScript or how this works.

Thanks a lot