fix test_search_files for windows

[k-boikov]

Background

Test fails on Windows due to windows directory separator.

Changes

Use os.path.join instead of hardcoded slash.

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -8.06 ⚠️

Comparison is base (e8473d4) 49.40% compared to head (9ade87d) 41.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3073      +/-   ##
==========================================
- Coverage   49.40%   41.34%   -8.06%     
==========================================
  Files          63       63              
  Lines        3004     3004              
  Branches      494      494              
==========================================
- Hits         1484     1242     -242     
- Misses       1400     1697     +297     
+ Partials      120       65      -55     

see 14 files with indirect coverage changes

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