security/zeek: Update to 3.0.8 and address various vulnerabilities:

https://github.com/zeek/zeek/releases/tag/v3.0.8

• Fix potential DNS analyzer stack overflow
• Fix potential NetbiosSSN analyzer stack overflow

Other fixes:

• Fix DHCP Client ID Option misformat for Hardware Type 0
• Fix/allow copying/cloning of opaque of Broker::Store
• Fix ConnPolling memory over-use
• Fix compress_path not normalizing some paths correctly
• Fix integer conversion error for Tag subtypes/enums
• Fix bro_prng() results not staying within modulus
• Prevent providing a 0 seed to bro_prng() since the LCG parameters don't allow that

Reported by: Jon Siwek
MFH: 2020Q3
Security: e333084c-9588-4eee-8bdc-323e02cb4fe0