security/vuxml: Mark zeek < 5.0.6 as vulnerable as per:

https://github.com/zeek/zeek/releases/tag/v5.0.6

This release fixes the following potential DoS vulnerabilities:

• A missing field in the SMB FSControl script-land record could cause a heap buffer overflow when receiving packets containing those header types.
• Receiving a series of packets that start with HTTP/1.0 and then switch to HTTP/0.9 could cause Zeek to spend a large amount of time processing the packets.
• Receiving large numbers of FTP commands sequentially from the network with bad data in them could cause Zeek to spend a large amount of time processing the packets, and generate a large amount of events.

Reported by: Tim Wojtulewicz