sync exercises

[keiravillekode]

We sync

• bob
• perfect-numbers
• state-of-tic-tac-toe

[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.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

For more information, refer to the documentation. If you are unsure whether to add the message or not, please ping @exercism/maintainers-admin in a comment. Thank you!

[BNAndras]

Thanks. Syncing docs and metadata together is fine, but in the future, I prefer separate PRs for each exercise test suite being updated. That provides me some control if I want to rerun existing solutions for an exercise without affecting other exercises.