chore(deps): update gatsby monorepo

Author: renovate-bot

www/package.json

@@ -16,9 +16,9 @@
     "bootstrap": "^4.6.0",
     "dom-helpers": "^5.2.0",
     "emotion": "^10.0.27",
-    "gatsby": "^2.32.11",
+    "gatsby": "^3.6.1",
     "gatsby-plugin-astroturf": "^0.2.1",
-    "gatsby-plugin-sass": "^2.8.0",
+    "gatsby-plugin-sass": "^4.6.0",
     "lodash": "^4.17.21",
     "prop-types": "^15.7.2",
     "react": "^16.14.0",