bpo-27827: identify a greater range of reserved filename on Windows. (GH-26698) (GH-27421)

`pathlib.PureWindowsPath.is_reserved()` now identifies as reserved
filenames with trailing spaces or colons.

Co-authored-by: Barney Gale <barney.gale@foundry.com>
Co-authored-by: Eryk Sun <eryksun@gmail.com>
(cherry picked from commit 56c1f6d7edad454f382d3ecb8cdcff24ac898a50)