[3.14] gh-132983: Fix small issues with zstd support in zipfile (GH-133723) (#133974)

gh-132983: Fix small issues with zstd support in zipfile (GH-133723)
(cherry picked from commit 35f47d05893e012e9f2b145b934c1d8c61d2bb7d)

Co-authored-by: Carey Metcalfe <carey@cmetcalfe.ca>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Emma Smith <emma@emmatyping.dev>