[zlib] Completing sync with zlib 1.3.0.1

Updating readme file to the matching zlib version, the job
is done for now.

Bug: 1447443
Change-Id: Ic0cd4570127260cd7f5dcf6d656d0b7707a94c37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5077550
Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1232085}
NOKEYCHECK=True
GitOrigin-RevId: c443270ea28dee874acdefa40a5dd05d4e53b72f