Updated the version requirements for running the current back office

[richarth]

Building the current version of the back office is only supported on Node v16 and earlier so have updated the docs to reflect that.

[github-actions]

Hi there @richarth, thank you for this contribution! 👍

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[JasonElkin]

Hey @richarth, thanks for updating this, it is an interesting one...

Node v16.19.1 is required to run the tests, but just running the build-only gulp tasks works all the way up to v19.7.0 (current latest version).

When running the frontend build as part of the default (.NET/C#) project build the tests are skipped, so there is still no upper limit when it comes to "building" Umbraco from source.

If you think it would be helpful, perhaps you could add a separate note in here about the node version required for running the tests?

[JasonElkin]

Assuming this PR gets merged, the gulp tests (and default gulp build) will then work on all Node.js versions from 14 to 19.

[nul800sebastiaan]

Thanks both @richarth for helping with the updates and @JasonElkin for fixing #13968 so that the requirements span a nice wide range of node versions again. Much nicer to be able to support the latest LTS of node!

[nul800sebastiaan]

FYI: I've not put any additional labels on, this is an update that only affects contributors, not an actual Umbraco release.

Thanks again!

[richarth]

Thanks @JasonElkin and @nul800sebastiaan for fixing this. It's going to make getting started contributing much smoother.