The `set-output` command is deprecated and will be disabled on 31 May 2023

[patrikhuber]

Hi,

I'm receiving a warning using this action:

Warning: The `set-output` command 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/

And the linked website says that the warning will result in a hard fail by 31 May / 1 June this year.

I'm not using this command in my msvc.yml, and I think this must come from a script somewhere within this action.