Upgrade grunt devDependency from 1.0.3 to 1.0.4 (#7099)

Author: xavierdecoster

src/Bootstrap/package-lock.json

@@ -36,7 +36,7 @@
     "btoa": "^1.2.1",
     "cross-env": "^5.2.0",
     "glob": "^7.1.3",
-    "grunt": "^1.0.3",
+    "grunt": "^1.0.4",
     "grunt-contrib-clean": "^2.0.0",
     "grunt-contrib-concat": "^1.0.1",
     "grunt-contrib-copy": "^1.0.0",