No copy vec, update to opencv 4.11.0

[rainyl]

fix:

• VideoWriter write a codec of ‘H264’ video，video is not clarity. #314
• Upgrade to OpenCV 4.11.0 #319
• Feature: Unsafe version of imencode() that does not copy #304

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 91.09646% with 108 lines in your changes missing coverage. Please review.

Project coverage is 92.62%. Comparing base (044f74d) to head (c55d231).

Files with missing lines	Patch %	Lines
packages/dartcv/lib/src/core/cv_vec.dart	54.44%	41 Missing ⚠️
packages/dartcv/lib/src/core/vec.dart	94.72%	17 Missing ⚠️
packages/dartcv/lib/src/core/mat.dart	44.82%	16 Missing ⚠️
packages/dartcv/lib/src/dnn/dnn.dart	57.57%	14 Missing ⚠️
packages/dartcv/lib/src/core/point.dart	94.81%	10 Missing ⚠️
packages/dartcv/lib/src/dnn/dnn_async.dart	84.00%	4 Missing ⚠️
packages/dartcv/lib/src/highgui/highgui.dart	0.00%	2 Missing ⚠️
packages/dartcv/lib/src/imgproc/imgproc_async.dart	88.88%	2 Missing ⚠️
packages/dartcv/lib/src/core/dmatch.dart	98.03%	1 Missing ⚠️
packages/dartcv/lib/src/imgproc/imgproc.dart	92.85%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #315      +/-   ##
==========================================
+ Coverage   92.05%   92.62%   +0.57%     
==========================================
  Files          49       49              
  Lines        9173     9507     +334     
==========================================
+ Hits         8444     8806     +362     
+ Misses        729      701      -28     

Flag	Coverage Δ
unittests	92.62% <91.09%> (+0.57%)	⬆️

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