git-packages.json can't be resolved on windows path

[raza2022]

@creeonix @rhyslbw @taylorkearns @sokki @jperl
I have completed all step to run a private package carefully. but when i run mgp command, it throws error that "Unable to load "(myproject till file)/git-packages.json". here i noticed that the path has a "/" instead of "" to reslove the git-packages.json file.
i.e it should be as
C:\dumm\dummyproject\git-packages.json
but it look like as
C:\dumm\dummyproject/git-packages.json
you can also point the js file where the path rosolve logic exists so i change it manually to test.
any help will be greatly appreciated