Updated grunt-saucelabs to the latest version

It was incorrectly set to 0.0.0 instead of 9.0.0 in
https://github.com/select2/select2/commit/288f0283b1c4f01ad06e7f13d5eab7600ccbfa49

package.json

@@ -57,7 +57,7 @@
     "grunt-gh-pages": "^0.9.1",
     "grunt-jekyll": "^0.4.2",
     "grunt-sass": "^1.0.0",
-    "grunt-saucelabs": "^0.0.0"
+    "grunt-saucelabs": "^9.0.0"
   },
   "dependencies": {
     "almond": "~0.3.1",