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: instructions unsynced: acronym
[warn] docs: instructions unsynced: affine-cipher
[warn] docs: instructions unsynced: all-your-base
[warn] docs: instructions unsynced: allergies
[warn] docs: instructions unsynced: armstrong-numbers
[warn] docs: instructions unsynced: binary-search
[warn] docs: instructions unsynced: book-store
[warn] docs: instructions unsynced: darts
[warn] docs: instructions unsynced: isogram
[warn] docs: instructions unsynced: knapsack
[warn] docs: instructions unsynced: perfect-numbers
[warn] docs: instructions unsynced: phone-number
[warn] docs: instructions unsynced: protein-translation
[warn] docs: instructions unsynced: rotational-cipher
[warn] metadata: unsynced: meetup
[warn] metadata: unsynced: strain
[warn] anagram: missing 1 test case
       - does not detect an anagram if the original word is repeated (630abb71-a94e-4715-8395-179ec1df9f91)
[warn] some exercises have unsynced docs
[warn] some exercises have unsynced metadata
[warn] some exercises are missing test cases

[verdammelt]

Fixed by #757