Update node-gyp dependency (#941)

Author: GaryWilber

package.json

@@ -36,7 +36,7 @@
     "jsdoc": "^3.4.0",
     "jshint": "^2.10.1",
     "mocha": "^5.2.0",
-    "node-gyp": "^5.1.0",
+    "node-gyp": "^8.4.1",
     "toolkit-jsdoc": "^1.0.0"
   },
   "dependencies": {