Update zlib to 1.3.2.1-motley

Bump third_party/externals/zlib from 1.3.0.1 to 1.3.2.1-motley
(Chromium fork).

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

Author: mattleibow

DEPS

@@ -70,7 +70,7 @@ deps = {
   # "third_party/externals/unicodetools"           : "https://chromium.googlesource.com/external/github.com/unicode-org/unicodetools@66a3fa9dbdca3b67053a483d130564eabc5fe095",
   # "third_party/externals/v8"                     : "https://chromium.googlesource.com/v8/v8.git@5f1ae66d5634e43563b2d25ea652dfb94c31a3b4",
   "third_party/externals/wuffs"                  : "https://skia.googlesource.com/external/github.com/google/wuffs-mirror-release-c.git@e3f919ccfe3ef542cfc983a82146070258fb57f8",
-  "third_party/externals/zlib"                   : "https://chromium.googlesource.com/chromium/src/third_party/zlib@e432200a7931de1b0b1b50201aac8a46d9380cb2",
+  "third_party/externals/zlib"                   : "https://chromium.googlesource.com/chromium/src/third_party/zlib@89921383f1f51331f48a2dc843403779770ea3a9",
 
   'bin': {
     'packages': [