Add Vaultwarden fingerprints

Description

Adds two Vaultwarden, unofficial Bitwarden server, fingerprints.

Notes

Fingerprinted Vaultwarden server Version 2022.12.0.

<link rel="icon" type="image/png" sizes="32x32" href="images/favicon-32x32.png"/>

$ favicon-32x32.png
favicon-32x32.png: PNG image data, 32 x 32, 8-bit gray+alpha, non-interlaced
$ md5 favicon-32x32.png
MD5 (favicon-32x32.png) = 9e8ba456e7e39ea364cc538959813719

<link rel="icon" type="image/png" sizes="16x16" href="images/favicon-16x16.png"/>

$ file favicon-16x16.png
favicon-16x16.png: PNG image data, 16 x 16, 8-bit gray+alpha, non-interlaced
$ md5 favicon-16x16.png
MD5 (favicon-16x16.png) = 86157069c9574d4c75b907e614d6a521

favicon.ico matches Bitwarden's hash 2f0df01346ace9afb440288feeb5d974 so it was excluded from the fingerprint

Motivation and Context

Improved coverage

How Has This Been Tested?

bundle exec ./bin/recog_verify xml/favicons.xml xml/html_title.xml
rake tests

Types of changes

New feature (non-breaking change which adds functionality)

Checklist:

[x] I have updated the documentation accordingly (or changes are not required).
[x] I have added tests to cover my changes (or new tests are not required).
[x] All new and existing tests passed.

rapid7 / recog