security/zeek: Update to 3.0.4 and address a remote crash vulnerability:

https://github.com/zeek/zeek/blob/e059d4ec2e689b3c8942f4aa08b272f24ed3f612/NEWS

• Fix stack overflow in POP3 analyzer. An attacker can crash Zeek remotely via crafted packet sequence.

Other fixes:

• Fix use-after-free in Zeek lambda functions with uninitialized locals
• Fix buffer overflow due to tables/records created at parse-time not rebuilt on record redef
• Fix SMB NegotiateContextList parsing
• Fix binpac flowbuffer frame length parsing doing too much bounds checking
• Fix parsing ERSPAN III optional sub-header
• Fix bug in intel indicator normalization
• Fix connection duration thresholding
• Fix X509Common.h header include for external plugins
• Fix incorrect targeting of node-specific Broker/Cluster messages

MFH: 2020Q2