security/vuxml: Mark zeek < 3.0.3 as vulnerable as per:

https://raw.githubusercontent.com/zeek/zeek/9dda3602a760f00d9532c6314ea79108106033fa/NEWS

There are a number of potential denial of service issues due to
memory leaks, buffer overflows, and a null pointer dereference.

Approved by: matthew (mentor, implicit)