fix: add feed validation removal for newer gtfs-kit versions

[RaczeQ]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.60%. Comparing base (7d3ca84) to head (cb9519b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
srai/loaders/gtfs_loader.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #486      +/-   ##
==========================================
+ Coverage   90.55%   90.60%   +0.05%     
==========================================
  Files          62       62              
  Lines        2509     2513       +4     
==========================================
+ Hits         2272     2277       +5     
+ Misses        237      236       -1     

Flag	Coverage Δ
macos-13-python3.12	90.52% <75.00%> (+0.05%)	⬆️
ubuntu-latest-python3.10	90.44% <75.00%> (-0.03%)	⬇️
ubuntu-latest-python3.11	90.52% <75.00%> (-0.03%)	⬇️
ubuntu-latest-python3.12	90.44% <75.00%> (-0.03%)	⬇️
ubuntu-latest-python3.9	90.43% <75.00%> (-0.11%)	⬇️
windows-latest-python3.12	90.44% <75.00%> (-0.03%)	⬇️

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