include node_modules so release .zip is deployable

node_modules/@smithy/middleware-serde/dist-es/serializerMiddleware.js

@@ -0,0 +1,13 @@
+export const serializerMiddleware = (options, serializer) => (next, context) => async (args) => {
+    const endpoint = context.endpointV2?.url && options.urlParser
+        ? async () => options.urlParser(context.endpointV2.url)
+        : options.endpoint;
+    if (!endpoint) {
+        throw new Error("No valid endpoint provider available.");
+    }
+    const request = await serializer(args.input, { ...options, endpoint });
+    return next({
+        ...args,
+        request,
+    });
+};