security/zeek: Update to 4.0.6

    https://github.com/zeek/zeek/releases/tag/v4.0.6

Security fixes since 4.0.5:

 - Fix potential unbounded state growth in the FTP analyzer when
   receiving a specially-crafted stream of commands. This may lead
   to a buffer overflow and cause Zeek to crash. Due to the possibility
   of this happening with packets received from the network, this
   is a potential DoS vulnerabilty.

Other changes:

 - Empty table constructors with &default attributes may cause a
   crash.

 - Fix a bug in ZAM when a function containing a loop is inlined

 - Fix a number of bugs with robust dictionary iteration.

 - Fix missing "Reporter" entries when reporting hooks via zeek.

Reported by:    Tim Wojtulewicz