Update selenium-standalone and gifsicle

These don't work with node 10, and are ancient, so we should update
them.

Change-Id: I19e67bf6d0a53e2d1e486bd0e89f19d3d5c6bd59

package.json

@@ -60,7 +60,7 @@
     "matchdep": "0.3.0",
     "protractor": "1.3.1",
     "requirejs": "2.1.15",
-    "selenium-standalone": "2.43.1-2.9.0-1"
+    "selenium-standalone": "6.16.0"
   },
   "dependencies": {
     "@fortawesome/fontawesome-free-webfonts": "^1.0.3",
@@ -78,7 +78,7 @@
     "angularjs-viewhead": "0.0.1",
     "bootstrap": "3.3.7",
     "bootstrap-sass": "^3.3.7",
-    "gifsicle": "1.0.0",
+    "gifsicle": "4.0.1",
     "highlightjs": "9.10.0",
     "markdown-it": "8.4.0",
     "moment-timezone": "0.5.4",