Bump grunt-sass to 1.1.0

This bumps the underlying version of node-sass to 3.4.0 and libsass to 3.3.0. It causes no difference in the current sass output.

Props netweb.
See #34177.



git-svn-id: https://develop.svn.wordpress.org/trunk@35539 602fd350-edb4-49c9-b593-d223f7449a82

package.json

@@ -28,7 +28,7 @@
     "grunt-patch-wordpress": "~0.3.0",
     "grunt-postcss": "~0.7.0",
     "grunt-rtlcss": "~1.6.0",
-    "grunt-sass": "~1.0.0",
+    "grunt-sass": "~1.1.0",
     "matchdep": "~1.0.0"
   }
 }