[3.11] gh-149018: Use `XML_SetHashSalt16Bytes` in `pyexpat`/`_elementtree` when possible (GH-149023) (GH-155345) (#155610)
* [3.11] gh-149018: Use `XML_SetHashSalt16Bytes` in `pyexpat`/`_elementtree` when possible (GH-149023) (GH-155345)
(cherry picked from commit e37df2a6a71d6538698e2d3188a7c345b827640b)
Co-authored-by: Stan Ulbrych <stan@python.org>
(cherry picked from commit fc9b11ff49cbc82e6f917d07a61517a2b5f3145f)
(cherry picked from commit 24b8f12544468e4cedf5bfbe25442fcd495391e4)
* Apply suggestions from code review
Co-authored-by: Stan Ulbrych <stan@python.org>