Update zlib (#472)

Author: Pilot-Pirx

main/external_deps.lst

@@ -103,8 +103,8 @@ if (SYSTEM_REDLAND != YES)
     URL2 = $(OOO_EXTRAS)$(MD5)-$(name)
 
 if (GUI!=UNX || SYSTEM_ZLIB!=YES)
-    MD5 = 9855b6d802d7fe5b7bd5b196a2271655
-    name = zlib-1.3.1.tar.gz
+    MD5 = a1e6c958597af3c67d162995a342138a
+    name = zlib-1.3.2.tar.gz
     URL1 = https://www.zlib.net/fossils/$(name)
     URL2 = $(OOO_EXTRAS)$(MD5)-$(name)