Update picture for Marit van Dijk

Author: mlvandijk

java-champions.yml

@@ -879,7 +879,7 @@ members:
       bluesky: https://bsky.app/profile/maritvandijk.bsky.social
       github: https://github.com/mlvandijk
       sessionize: https://sessionize.com/maritvandijk/
-    avatar: img/avatars/MaritvanDijk77.png
+    avatar: img/avatars/maritvandijk.png
   - name: Filippo Diotalevi
     year: 2005
     country: