Add teamspeak http server fingerprint

[dabdine]

Description

Adds a fingerprint for teamspeak. Over 20K of these on the internet, according to Censys.

How Has This Been Tested?

bundle exec rake tests

echo -n "TeamSpeak Server 3.13.6" | bin/recog_match xml/http_servers.xml | cut -c 8- | sed 's/=>/:/g' | jq .
{
  "matched": "TeamSpeak HTTP server",
  "service.vendor": "TeamSpeak",
  "service.product": "TeamSpeak",
  "service.family": "TeamSpeak",
  "service.version": "3.13.6",
  "service.cpe23": "cpe:/a:teamspeak:teamspeak:3.13.6",
  "service.protocol": "http",
  "fingerprint_db": "http_header.server",
  "data": "TeamSpeak Server 3.13.6"
}

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.

[mkienow-r7]

Thank you for the contribution @dabdine!