fix: add protocol-http dependency to apig mw (#659)

Author: AllanZhengYP

packages/middleware-sdk-api-gateway/package.json

@@ -14,6 +14,7 @@
   },
   "license": "Apache-2.0",
   "dependencies": {
+    "@aws-sdk/protocol-http": "^0.1.0-preview.1",
     "@aws-sdk/types": "^0.1.0-preview.7",
     "tslib": "^1.8.0"
   },