gradio

f53b24b0 - Fix file upload error due to file extension case differences. (#11771)

Fix file upload error due to file extension case differences. (#11771) * Normalize file extension to lowercase in upload * move toLowerCase() to avoid possible issues if pop() is undefined * add changeset --------- Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>