Replace the deprecated `set-output` command in the the github actions and workflows

[goulter]

"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/"

To do: replace the set-output command with whatever is suggested / not deprecated.