This update for knot fixes the following issues:

knot was updated to version 3.1.2, see:

- https://www.knot-dns.cz/2021-09-08-version-312.html
- https://www.knot-dns.cz/2021-08-10-version-311.html
- https://www.knot-dns.cz/2021-08-02-version-310.html
- https://www.knot-dns.cz/2021-06-16-version-307.html
- https://www.knot-dns.cz/2021-05-12-version-306.html
- https://www.knot-dns.cz/2021-03-25-version-305.html