bpo-46678: Fix Invalid cross device link in Lib/test/support/import_helper.py (GH-31204) (GH-31207)

In `Lib/test/support/import_helper.py`, the function `make_legacy_pyc` makes a call to `os.rename` which can fail when the source and target live on different devices. This happens (for example) when `PYTHONPYCACHEPREFIX` is set to a directory anywhere on disk, while a ramdisk is mounted on `/tmp` (the latter of which is the default on various Linux distros). Replacing `os.rename` with `shutil.move` fixes this.

Automerge-Triggered-By: GH:brettcannon
(cherry picked from commit da576e08296490e94924421af71001bcfbccb317)

Co-authored-by: Jason Wilkes <notarealdeveloper@gmail.com>