[DOC] Updated DNN detection tutorial

[rolalaro]

Updated the documentation of the DNN detection tutorial:

• Changed the branch of OpenCV and OpenCV_contrib folders to have more recent stable versions
• Stated that Yolo v11 is supported

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.82%. Comparing base (cb7aea6) to head (fe79ec1).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1504      +/-   ##
==========================================
- Coverage   53.84%   53.82%   -0.02%     
==========================================
  Files         442      442              
  Lines       53850    53850              
==========================================
- Hits        28996    28987       -9     
- Misses      24854    24863       +9     

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