Update dependency grunt to v1 [SECURITY]

Author: renovate[bot]

package.json

@@ -35,7 +35,7 @@
     "bunyan-request-logger": "2.1.0",
     "connect-cache-control": "1.0.0",
     "express": "4.17.1",
-    "grunt": "0.4.5",
+    "grunt": "1.5.3",
     "grunt-contrib-jshint": "1.1.0",
     "restify": "7.7.0",
     "supertest": "4.0.2",