security/vuxml: document www/chromium < 97.0.4692.71

While here add definitions for 2022, as this is the first vuxml commit
of the year. This cannot be done in its own commit because `make

validate` complains in that case (even with a 0-byte vuln-2022.xml).

Obtained from: https://chromereleases.googleblog.com/2022/01/stable-channel-update-for-desktop.html