Update hannahhavel.md (#2554)

Author: rct225

_fellows/2025/hannahhavel.md

@@ -9,7 +9,7 @@ active: True
 dates:
   start: 2025-06-23
   end: 2025-09-15
-photo: /assets/images/team/fellows-2025/Hannah-Havel.jpg
+photo: /assets/images/team/fellows-2025/Hannah-Havel.JPG
 institution: Northern Illinois University
 e-mail: [email protected]
 focus-area: as