chore: update workflows from templates

[nextcloud-command]

This PR was automatically generated by the workflow dispatcher
Please check that there are no reverted changes before merging ⚠

See templates in https://github.com/nextcloud/.github

[max-nextcloud]

All in all looks good. I think we want to keep php-unit tests accorss a variety of php and server versions. @GretaD what do you think?

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[max-nextcloud]

I went ahead keeping the broader test matrix as mentioned.