chg: nil: Update CVE checklist

This MR adds an extra CVE checklist step suggested by @pspacek after
CVE-2024-0760.  See [Mattermost][1] for context.

It also syncs checklist steps with their corresponding links to the
explanations wiki page as these have been out-of-sync since !9307.

[1]: https://mattermost.isc.org/isc/pl/156npi4bwtr6pechbj6sfs6jjo

Merge branch 'michal/update-cve-checklist' into 'main'

See merge request isc-projects/bind9!9949