fix: allow grayskull to run on github urls

[beckermr]

Description:

This PR allows grayskull to run on packages with github urls.

Checklist:

• Pydantic model updated or no update needed

Cross-refs, links to issues, etc:

closes #3169

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 77.77%. Comparing base (842a0d7) to head (c8e8f9f).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
conda_forge_tick/update_deps.py	88.88%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3199      +/-   ##
==========================================
+ Coverage   77.66%   77.77%   +0.11%     
==========================================
  Files         124      124              
  Lines       13389    13424      +35     
==========================================
+ Hits        10398    10441      +43     
+ Misses       2991     2983       -8     

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