Fix Matrix3_TEST.py on Windows with conda-forge dependencies

[traversaro]

🦟 Bug fix

Fixes #416

Summary

See #416 (comment)

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[codecov]

Codecov Report

Merging #561 (76c2da7) into gz-math7 (416e559) will not change coverage.
The diff coverage is n/a.

❗ Current head 76c2da7 differs from pull request most recent head 8ee32c9. Consider uploading reports for the commit 8ee32c9 to get more accurate results

@@            Coverage Diff            @@
##           gz-math7     #561   +/-   ##
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  Coverage     94.16%   94.16%           
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  Files           145      145           
  Lines          9774     9774           
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  Hits           9204     9204           
  Misses          570      570