[3.9] bpo-42345: Add whatsnew and versionchanged for typing.Literal in 3.9 (GH-23386) #23411
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Needs backport to 3.9.
(cherry picked from commit e1dc0db)
Co-authored-by: kj 28750310+Fidget-Spinner@users.noreply.github.com
https://bugs.python.org/issue42345