Re-enable warning 4244 (#952)

Update zlib submodule from v1.3 to v1.3.2 which includes explicit casts
that resolve C4244 warnings (commit 8a76f02 by levib@microsoft.com).
This allows removing the /wd4244 suppression from the Zlib build items
without breaking builds that use /WX (TreatWarningAsError).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: jplafonta