Replace deprecated set-output with GITHUB_OUTPUT

[pergardebrink]

When running the GitHub Action for snyk-setup-action: https://github.com/snyk/actions/tree/master/setup#snyk-setup-action, I get an error that the set-output is deprecated in GitHub Actions:

This PR changes set-output to use the GITHUB_OUTPUT instead as recommended by GitHub: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

[pergardebrink]

Another related issue: The snyk version result for the github action is different from what you normally see when running the Snyk CLI locally.

For example, running the GitHub action vs. my local machine:
GitHub Actions output for snyk version:

1.1045.0 (standalone)

Locally (windows)

$ snyk version
1.1045.0

It seems like the linux build has a (standalone) suffix. If I download the snyk cli the same way as the GitHub Action does by pulling like this: https://docs.snyk.io/snyk-cli/install-the-snyk-cli#install-with-standalone-executables I only get the (standalone) suffix when running the linux standalone binary and not with the windows binary.

[codebydant]

@mathroule would be nice to have the issues or discussions tabs enabled to ask questions or feature requests. It would be nice to have support for defining PR title and commit message format with a prefix in order to meet PR title validator in the CI pipelines.

Currently the format is [snyk] bump ...

[bastiandoetsch]

LGTM, thanks for the contribution.