Run full test diff for the latest CI Python version only

[mvorisek]

@markstory thank you for merging #60

fixes https://github.com/markstory/sphinxcontrib-phpdomain/pull/60#issuecomment-1683219323

latest Python version should be always fully tested

as older Sphinx deps might imply different than expected output, older Python versions are tested like before #60, ie. for build to pass only

I have also reenabled cron, cron is good to monitor the tests on continuous basis and thanks to GH it is visible for everyone, even for non-contributors, and is free.

[mvorisek]

@markstory can this CI fix PR be merged?

[markstory]

I have also reenabled cron, cron is good to monitor the tests on continuous basis and thanks to GH it is visible for everyone, even for non-contributors, and is free.

It isn't free though. It consumes resources (energy and time) and needlessly wastes those resources.

[mvorisek]

@markstory PR feedback is addressed, is there anything else to do?

[mvorisek]

Hi @markstory, this PR is here for a while and all the feedback should be addressed, may I ask you to merge it?

[mvorisek]

@markstory, can you please review?