chore(deps): Bump gradio in /backend/python/openvoice

Bumps [gradio](https://github.com/gradio-app/gradio) from 3.48.0 to 5.5.0.
- [Release notes](https://github.com/gradio-app/gradio/releases)
- [Changelog](https://github.com/gradio-app/gradio/blob/main/CHANGELOG.md)
- [Commits](https://github.com/gradio-app/gradio/compare/[email protected]@5.5.0)

---
updated-dependencies:
- dependency-name: gradio
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

backend/python/openvoice/requirements.txt

@@ -15,6 +15,6 @@ pypinyin
 cn2an==0.5.22
 networkx==2.8.8
 jieba==0.42.1
-gradio==3.48.0
+gradio==5.5.0
 langid==1.1.6
 llvmlite==0.43.0