Release the GIL when munmap'ing tensors - fixes #77139 (#83623)
Fixes #77139, where deallocating large tensors with munmap takes a significant amount of time while holding the GIL. This causes the pin_memory thread to interfere with the main thread = performance sadness.
Thanks @igozali @zhengwy888 @colesbury as well.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/83623
Approved by: https://github.com/albanD
