Fix test pipeline

[anawas]

This PR fixes #678.

Changes:

• Pinned the version of setuptools in environment.yaml to >=69.0.0,<70.0.0
• Changed the code in karabo/simulation/signal/seg_u_net_segmentation.py` to use the latest api.

See why I did this at the issue.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.03%. Comparing base (9252502) to head (01d7431).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
karabo/simulation/signal/seg_u_net_segmentation.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #680      +/-   ##
==========================================
- Coverage   71.05%   71.03%   -0.03%     
==========================================
  Files          56       56              
  Lines        5815     5817       +2     
==========================================
  Hits         4132     4132              
- Misses       1683     1685       +2     

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