fix decode animated image leak

Author: iatbowen

SDWebImageAVIFCoder/Classes/SDImageAVIFCoder.m

@@ -149,6 +149,7 @@ - (UIImage *)decodedImageWithData:(NSData *)data options:(SDImageCoderOptions *)
 #else
  UIImage *image = [[UIImage alloc] initWithCGImage:imageRef scale:scale orientation:UIImageOrientationUp];
 #endif
+ CGImageRelease(imageRef);
  NSTimeInterval duration = decoder->imageTiming.duration; // Should use `decoder->imageTiming`, not the `decoder->duration`, see libavif source code
  SDImageFrame *frame = [SDImageFrame frameWithImage:image duration:duration];
  [frames addObject:frame];