[FEATURE REQUEST] Update to stable YOLO v4

[LdDl]

Is your feature request related to a problem? Please describe. Latest commit I've used: f056fc3b6a11528fa0522a468eca1e909b7004b7

But there is a new stable release of YOLO v4 (29th October 2021): https://github.com/AlexeyAB/darknet/releases/tag/yolov4

Describe the solution you'd like and provide pseudocode examples if you can Need to:

• change Makefile to latest stable commit of AlexeyAB's repository.
• check examples work
• check CGO code (refactor if needed)
• check for memory leaks (I can use valgrind)

Describe alternatives you've considered and provide pseudocode examples if you can nope

Additional context nope

[LdDl]

working on it in https://github.com/LdDl/go-darknet/pull/23