Update filib

[zfergus]

Description

Update filib and ensure it is linked as a shared library to avoid licensing IPC Toolkit under LGPL

Filib is still completely optional and can be disabled entirely (if LGPL is too scary 😜).

Type of change

• Enhancement (non-breaking change which improves existing functionality)

Checklist:

• I have followed the project style guide
• My code follows the clang-format style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.31%. Comparing base (a34c034) to head (18608f5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
- Coverage   96.32%   96.31%   -0.02%     
==========================================
  Files         102      102              
  Lines        7601     7601              
==========================================
- Hits         7322     7321       -1     
- Misses        279      280       +1     

Flag	Coverage Δ
unittests	96.31% <100.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.