Merge pull request #12444 from twbs/grunt-saucelabs-update

update to grunt-saucelabs v5.0.0

package.json

@@ -47,7 +47,7 @@
     "grunt-html-validation": "~0.1.13",
     "grunt-jekyll": "~0.4.1",
     "grunt-jscs-checker": "~0.3.0",
-    "grunt-saucelabs": "~4.1.2",
+    "grunt-saucelabs": "~5.0.0",
     "grunt-sed": "~0.1.1",
     "load-grunt-tasks": "~0.3.0",
     "markdown": "~0.5.0"