grpc-js: Pin @types/lodash to fix broken build

Author: murgatroid99

packages/grpc-js/package.json

@@ -17,7 +17,7 @@
   "devDependencies": {
     "@types/gulp": "^4.0.6",
     "@types/gulp-mocha": "0.0.32",
-    "@types/lodash": "^4.14.108",
+    "@types/lodash": "4.14.186",
     "@types/mocha": "^5.2.6",
     "@types/ncp": "^2.0.1",
     "@types/pify": "^3.0.2",