fix(deps): update dependency next to v9.1.1

Author: renovate-bot

package.json

@@ -22,7 +22,7 @@
     "clean-css": "4.2.1",
     "clsx": "1.0.4",
     "debug": "4.1.1",
-    "next": "9.0.6-canary.1",
+    "next": "9.1.1",
     "postcss": "7.0.18",
     "ramda": "0.26.1",
     "react": "16.9.0",