fix: normalization to prevent divison-by-zero

[jkbmrz]

Adding a quick fix to prevent divison-by-zero when we un-normalize images.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 36.13%. Comparing base (97ef45a) to head (e42f3ad).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
depthai_nodes/ml/parsers/utils/denormalize.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
- Coverage   36.15%   36.13%   -0.03%     
==========================================
  Files          70       70              
  Lines        3986     3991       +5     
==========================================
+ Hits         1441     1442       +1     
- Misses       2545     2549       +4     

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