Update bundled zlib to 1.2.13.1

This fixes CVE-2022-37434 (which shouldn't normally affect the use of zlib in wxWidgets but it still seems better to not have it than to have). See #22919. (cherry picked from commit b4f1ae6)
wxWidgets · Jan 29, 2023 · 54cecd5 · 54cecd5
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diff --git a/docs/changes.txt b/docs/changes.txt
@@ -244,6 +244,7 @@ All:
 - Fix memory leak when destroying wxThread (Antti Nietosvaara, #22840).
 - Add serial number to wxwin.m4 file (#22848).
 - Update Expat submodule to include the fix for CVE-2022-40674.
+- Update zlib to 1.2.13.1 to include the fix for CVE-2022-37434 (#22919).
 - Allow 'T' separator in wxDateTime::ParseDateTime() (Blake-Madden, #22999).
 - Add Serbian translations (Nikola Jović).
 - Fix MT-safety problem in wxZipInputStream (#23054).

diff --git a/src/zlib b/src/zlib