bump zlib to 1.3.2 (#415)

Author: hendrikmuhs

docker/scripts/install_zlib.sh

@@ -3,7 +3,7 @@ set -eu
 
 ZLIB_MAJOR=1
 ZLIB_MINOR=3
-ZLIB_PATCH=1
+ZLIB_PATCH=2
 
 ZLIB_VERSION="${ZLIB_MAJOR}.${ZLIB_MINOR}.${ZLIB_PATCH}"
 ZLIB_TAR="zlib-${ZLIB_VERSION}.tar.gz"