update example

[ohmyguigs]

I don't know if this is recent, but in github docs its says Job outputs are strings. So the if does not work with ! notation.
I could make it work using this comparisson notation == 'false' instead.

Sauce: https://docs.github.com/en/actions/using-jobs/defining-outputs-for-jobs#:~:text=Job%20outputs%20are%20strings%2C

[tspascoal]

@ohmyguigs good catch.

Thank you for your contribution