Notable changes in Python 3.14

[adang1345]

Notes to self for when I start working on Python 3.14 on Windows 7.

Test the pathlib.Path.copy() method introduced in python/cpython#119058 and modified in python/cpython@f09d184. It uses CopyFile2(), which is not available on Windows 7, but it appears to have a fallback when it's not available. I think this method will work fine on Windows 7, but I should test it.

Update patches to account for python/cpython@fac5e7a, which raises the minimum supported version to Windows 10.