I got the same issues after change PC and redownload the same flutter sdk (looks like they still update fix bug if the old version was not too old). I'm using flutter 3.24.3 .

Navigate to : <your flutter sdk folder>\flutter\packages\flutter_test\pubspec.yaml

And unpin by edit path: #1.9.0

Another way to solve your issues is separate clone video_trimmer module to your lib and update pubspec.yaml of video_trimmer