The `set-output` command is deprecated and will be disabled soon

[davidboweninrupt]

Github reports this warning when the action is run:

The set-outputcommand is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/ It would be great if it was adapted to use the new mechanism.