fix: deep targets file path

[mrjoelkamp]

Summary

• fixes bug in DownloadTarget for target files that are in subdirectories that are more than one level deep

Fixes

fixes #631

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 72.90%. Comparing base (14cf073) to head (23b08c0).
Report is 20 commits behind head on master.

Files	Patch %	Lines
metadata/updater/updater.go	0.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #632      +/-   ##
==========================================
+ Coverage   70.51%   72.90%   +2.38%     
==========================================
  Files          10       10              
  Lines        2123     1657     -466     
==========================================
- Hits         1497     1208     -289     
+ Misses        505      328     -177     
  Partials      121      121              

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[trishankatdatadog]

Thanks @MDr164.

@mrjoelkamp Would you mind terribly much rebasing against base, please?