fix: Ignore linux source packages

[another-rex]

Linux source packages are likely to be kernel packages, which generally do not apply in a container context,

[hogo6002]

Thanks Rex!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 68.75000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 69.07%. Comparing base (905d53b) to head (4b48c91).

Files with missing lines	Patch %	Lines
pkg/osvscanner/filter.go	64.28%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1523      +/-   ##
==========================================
- Coverage   69.08%   69.07%   -0.02%     
==========================================
  Files         197      197              
  Lines       18864    18880      +16     
==========================================
+ Hits        13033    13041       +8     
- Misses       5129     5134       +5     
- Partials      702      705       +3     

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