[3.11] gh-123270: Replaced SanitizedNames with a more surgical fix. (GH-123354) (#123425)

Applies changes from zipp 3.20.1 and jaraco/zippGH-124
(cherry picked from commit 2231286d78d328c2f575e0b05b16fe447d1656d6)

Co-authored-by: Jason R. Coombs <jaraco@jaraco.com>

* Restore the slash-prefixed paths in the malformed_paths test.