Roll third_party/libpng/ e541f0335..20d2554f8 (1 commit)

https://chromium.googlesource.com/chromium/src/third_party/libpng.git/+log/e541f033515b..20d2554f81db

Created with:
  roll-dep third_party/libpng

Change-Id: I023e4005ac65475a7ecf981edae517fc7b8bce75
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/101914
Auto-Submit: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nigi <nigi@chromium.org>
Commit-Queue: Nigi <nigi@chromium.org>
diff --git a/DEPS b/DEPS
index 7a8d554..2fac183 100644
--- a/DEPS
+++ b/DEPS
@@ -112,7 +112,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libpng
   # and whatever else without interference from each other.
-  'libpng_revision': 'e541f033515bee926ea3ddc16f67be2188b12c3f',
+  'libpng_revision': '20d2554f81dbe5994d7ee11e3744a47cf8d71d34',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libunwind
   # and whatever else without interference from each other.