What action? Something is being deprecated

[ValWood]

@kimrutherford @manulera

[kimrutherford]

Follow these docs, I've made my best guess at what the fix should be to get rid of the warning:

• https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
• https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#environment-files

We'll need to check the output next time a release is made.

[ValWood]

I assume this was OK, I think I made a release since?