Sync connect tests

[keiravillekode]

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[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

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[kahgoh]

Looking into the CI failures on this one, I think the errors has nothing to do with the changes here.

The only way I could reproduce the CI error using bin/test was to update V lang to the latest on their main branch.

If I download and use the latest release of V (0.5.1), bin/test works completely fine. However, if I run v up it seems to use Git to update to the latest version of V on their main branch. If I then run bin/test I then get similar errors as the CI (there are errors with both Grade School and Zebra Puzzle). I am thinking this being a problem with V itself since it isn't using a "release" version. Output from the setup Vlang action also suggests it was on 737163c, which isn't tagged as a release version. @keiravillekode, what do you think about tying the action to specific version of V?

[keiravillekode]

Sure.

There remains the issue that students might download the next V release and experience the bug, so we should also report it.

[kahgoh]

Nevermind, I think the errors were caused by trying to add items to lists that were not initialized properly. I have raised a PR #293 to fix. There are probably still issues to report to the V lang project, but I'll do that later.