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: affine-cipher
[warn] docs: instructions unsynced: pascals-triangle
[warn] docs: introduction missing: pascals-triangle
[warn] docs: instructions unsynced: pig-latin
[warn] metadata: unsynced: yacht
[warn] protein-translation: missing 1 test case
       - Sequence of two non-STOP codons does not translate to a STOP codon (f6f92714-769f-4187-9524-e353e8a41a80)
[warn] some exercises have unsynced docs
[warn] some exercises have unsynced metadata
[warn] some exercises are missing test cases

[verdammelt]

Fixed by #823