Out of sync practice exercises

[github-actions]

Out of sync practice exercises have been detected:

Command: configlet sync --tests --docs --metadata --filepaths

Output:

Checking exercises...
[warn] docs: introduction unsynced: eliuds-eggs
[warn] docs: instructions unsynced: meetup
[warn] crypto-square: missing 1 test case
       - 54 character plaintext results in 8 chunks, the last two with trailing spaces (33fd914e-fa44-445b-8f38-ff8fbc9fe6e6)
[warn] some exercises have unsynced docs
[warn] some exercises are missing test cases