Update niharikabhavaraju.md (#220)

Fix the extension of the author image.

### Description

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### Issues Resolved

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### Check List
- [ ] Commits are signed per the DCO using `--signoff`

By submitting this pull request, I confirm that my contribution is made
under the terms of the BSD-3-Clause License.

Signed-off-by: Madelyn Olson <[email protected]>

Author: madolson

content/authors/niharikabhavaraju.md

@@ -1,7 +1,7 @@
 ---
 title: Niharika Bhavaraju
 extra:
-    photo: '/assets/media/authors/niharikab.jpeg'
+    photo: '/assets/media/authors/niharikab.jpg'
     github: niharikabhavaraju
 ---