docs: Fix testimonial profile picture link (#3585)

## Description

Update the link for the profile picture of https://x.com/bran_aust in
their testimonial.

## Test plan

Build the docs and check testimonials - the image should load properly

Author: j-piasecki

packages/docs-gesture-handler/src/components/Testimonials/TestimonialList/index.tsx

@@ -39,7 +39,7 @@ const items = [
     link: 'https://twitter.com/bran_aust/status/1754907731536863670',
     image: {
       alt: 'brandon austin',
-      src: 'https://pbs.twimg.com/profile_images/1807358745401286656/u6hI6CYo_400x400.jpg',
+      src: 'https://pbs.twimg.com/profile_images/1886569538356977664/HSO3O8hT_400x400.jpg',
     },
   },
 ];