proposal: set-output is deprecated. Replace in docs with latest usage

[jamesmortensen]

Checklist

• [X] I am using the latest version of this action.
• [X] I have read the latest README and followed the instructions.
• [X] I have read the latest GitHub Actions official documentation and learned the basic spec and concepts.

Describe your proposal

There is a deprecated usage of setting step outputs in the documentation.

Describe the solution you'd like

Let's fix it so it's using the new non-deprecated usage.

Describe alternatives you've considered

No alternatives

Additional context

This line in the documentation is deprecated in GitHub Actions:

echo "::set-output name=HUGO_VERSION::${HUGO_VERSION}"

It can be replaced with this instead:

echo "HUGO_VERSION=$HUGO_VERSION" >> $GITHUB_OUTPUT

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

[peaceiris]

Nice catch, Thank you!

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