security/vuxml: Mark security/zeek < 8.0.6 as vulnerable as per:

https://github.com/zeek/zeek/releases/tag/v8.0.6

This release fixes the following potential DoS vulnerability:

• Zeek's HTTP analyzer can be tricked into interpreting Transfer-Encoding or Content-Length headers set in MIME entities within HTTP bodies and change the analyzer behavior.

Reported by: Tim Wojtulewicz