fix: Add ubuntu namespace to dep type of purl

[Avgor46]

Hi! I've added "ubuntu" namespace to deb type. Osv-scanner could not parse my custom dpkg BOM generated with osv-scalibr on Ubuntu system.

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[Avgor46]

@another-rex, @cuixq, could someone review PR?

[another-rex]

LGTM, thanks!

[cuixq]

LGTM - @Avgor46 can you address the lint issue?

[Avgor46]

@cuixq, Fixed. It seems that this robot PR fixes all other unit tests.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.60%. Comparing base (253503e) to head (98f0cf7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1916   +/-   ##
=======================================
  Coverage   65.60%   65.60%           
=======================================
  Files         167      167           
  Lines       16060    16060           
=======================================
  Hits        10536    10536           
  Misses       4859     4859           
  Partials      665      665           

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