fix avatar link for @bedroge

Author: boegel

docs/blog/.authors.yml

@@ -42,7 +42,7 @@ authors:
   bedroge:
     name: Bob Dröge
     description: University of Groningen
-    avatar: https://avatars.githubusercontent.com/u/11518551?v=4
+    avatar: https://avatars.githubusercontent.com/u/11991359?v=4
     slug: https://github.com/bedroge
   TopRichard:
     name: Richard Topouchian