chore: update roadmap content json (#8135)

Co-authored-by: kamranahmedse <4921183+kamranahmedse@users.noreply.github.com>

public/roadmap-content/data-analyst.json

@@ -670,7 +670,7 @@
     "links": [
       {
         "title": "Outliers",
-        "url": "%5Bhttps://www.mathsisfun.com/data/outliers.html",
+        "url": "https://www.mathsisfun.com/data/outliers.html",
         "type": "article"
       }
     ]