Upgrade zlib to 61bddccfbf47b9e6bbce6e39d3f2458e27c58c6a

Test: None
Change-Id: I30abdd531fd89c408316b432d6ea29f5d5011908
diff --git a/METADATA b/METADATA
index 8ded67a..3c7ac8a 100644
--- a/METADATA
+++ b/METADATA
@@ -5,11 +5,11 @@
     type: GIT
     value: "https://chromium.googlesource.com/chromium/src/third_party/zlib/"
   }
-  version: "c2eb8a7f7a0fa7884234ebc1b836644084ccbec9"
+  version: "61bddccfbf47b9e6bbce6e39d3f2458e27c58c6a"
   license_type: NOTICE
   last_upgrade_date {
     year: 2020
-    month: 3
-    day: 8
+    month: 4
+    day: 13
   }
 }