Compile libsif with the flag -O3

[amontoison]

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[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.03%. Comparing base (f2ad6a4) to head (4cf34db).
Report is 88 commits behind head on main.

Files with missing lines	Patch %	Lines
src/sifdecoder.jl	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #405       +/-   ##
===========================================
- Coverage   89.11%   74.03%   -15.09%     
===========================================
  Files           5        8        +3     
  Lines         790     1629      +839     
===========================================
+ Hits          704     1206      +502     
- Misses         86      423      +337     

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