Tighten the search for actual version sources

[pavoljuhas]

Skip any build directories when searching for _version.py files.
These may contain temporary copies of _version.py files which should
be ignored.

Fixes #7602

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.50%. Comparing base (c517794) to head (bbda5fc).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
dev_tools/modules.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7615      +/-   ##
==========================================
- Coverage   97.50%   97.50%   -0.01%     
==========================================
  Files        1103     1103              
  Lines       99683    99685       +2     
==========================================
+ Hits        97198    97199       +1     
- Misses       2485     2486       +1     

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[mhucka]

LGTM!