Use >>$GITHUB_OUTPUT instead of ::set-output

[lpulley]

::set-output is being deprecated soon and >>$GITHUB_OUTPUT will work as of runner version 2.297.0.

[github-actions]

Thanks for implementing a fix, could you ensure that the test covers your changes if applicable.

[jackton1]

@all-contributors please add @lpulley for code

[allcontributors]

@jackton1

I've put up a pull request to add @lpulley! 🎉

[lpulley]

Personally I think it's silly that <<EOF is standard but >>foo is considered hard to read, but whatever y'all prefer is fine. I just want to get this in before it gets deprecated.