bump up libwebsockets (#1457)

for client cert patch

Author: ikicha

scripts/cross-build.sh

@@ -14,7 +14,7 @@ ZLIB_VERSION="${ZLIB_VERSION:-1.3.1}"
 JSON_C_VERSION="${JSON_C_VERSION:-0.17}"
 MBEDTLS_VERSION="${MBEDTLS_VERSION:-2.28.5}"
 LIBUV_VERSION="${LIBUV_VERSION:-1.44.2}"
-LIBWEBSOCKETS_VERSION="${LIBWEBSOCKETS_VERSION:-4.3.3}"
+LIBWEBSOCKETS_VERSION="${LIBWEBSOCKETS_VERSION:-4.3.6}"
 
 build_zlib() {
     echo "=== Building zlib-${ZLIB_VERSION} (${TARGET})..."