Roll third_party/zlib/ cff720848..d866d41e1 (3 commits)

https://chromium.googlesource.com/chromium/src/third_party/zlib.git/+log/cff720848d7d..d866d41e168e

Created with:
  roll-dep third_party/zlib

Change-Id: I38a8c1adc6211335744a6edc0ad5433205fb0e2d
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/101912
Reviewed-by: K. Moon <kmoon@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>
Auto-Submit: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index b530fba..4bef73f 100644
--- a/DEPS
+++ b/DEPS
@@ -168,7 +168,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling zlib
   # and whatever else without interference from each other.
-  'zlib_revision': 'cff720848d7ddad191354f153f7acbb43af09b74',
+  'zlib_revision': 'd866d41e168ec04545bb17031fa911007a0581f4',
 }
 
 # Only these hosts are allowed for dependencies in this DEPS file.