security/zeek: Update to 7.0.8

https://github.com/zeek/zeek/releases/tag/v7.0.8

This release fixes the following bugs:

• GCC 15.1 failed to build both Zeek and the integrated Paraglob library.
• The requirement for the BIND library to be present for the build was removed.
• The Spicy submodule was updated to v1.11.5. This version brings a fix for a compilation failure when iterating over a byte value.

Reported by: Tim Wojtulewicz