dep: update to zlib 1.3.1

See #3172

(backport of 880660b)

Author: flavorjones

dependencies.yml

@@ -1,4 +1,4 @@
-
+---
 libxml2:
   version: "2.12.6"
   sha256: "889c593a881a3db5fdd96cc9318c87df34eb648edfc458272ad46fd607353fbb"
@@ -10,8 +10,8 @@ libxslt:
   # sha-256 hash provided in https://download.gnome.org/sources/libxslt/1.1/libxslt-1.1.39.sha256sum
 
 zlib:
-  version: "1.3"
-  sha256: "ff0ba4c292013dbc27530b3a81e1f9a813cd39de01ca5e0f8bf355702efa593e"
+  version: "1.3.1"
+  sha256: "9a93b2b7dfdac77ceba5a558a580e74667dd6fede4585b91eefb60f03b72df23"
   # SHA-256 hash provided on http://zlib.net/
 
 libiconv: