🐛 Correct y-direction boundary for Moore neighborhood

[Drewniok]

Description

This PR uses the correct y-direction boundary for Moore neighborhood. An appropriate test is added.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[marcelwa]

Wow, good catch! Thank you 🙏

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e25b188) 96.02% compared to head (7f6b343) 96.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #331      +/-   ##
==========================================
+ Coverage   96.02%   96.04%   +0.02%     
==========================================
  Files         100      100              
  Lines        9974     9974              
==========================================
+ Hits         9578     9580       +2     
+ Misses        396      394       -2     

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[github-actions]

clang-tidy review says "All clean, LGTM! 👍"