Update version to 2025.0.0-beta-3

[Gold872]

Also cancel bandwidth timers when a camera stream is removed

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 66.17%. Comparing base (ce6d05b) to head (4c7af37).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/widgets/mjpeg.dart	0.00%	2 Missing ⚠️
.../widgets/nt_widgets/multi-topic/camera_stream.dart	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
- Coverage   66.18%   66.17%   -0.01%     
==========================================
  Files          78       78              
  Lines        8026     8027       +1     
==========================================
  Hits         5312     5312              
- Misses       2714     2715       +1     

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