build(deps): bump soundfile from 0.12.1 to 0.13.1 in /backend

Bumps [soundfile](https://github.com/bastibe/python-soundfile) from 0.12.1 to 0.13.1.
- [Release notes](https://github.com/bastibe/python-soundfile/releases)
- [Commits](https://github.com/bastibe/python-soundfile/compare/0.12.1...0.13.1)

---
updated-dependencies:
- dependency-name: soundfile
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

backend/requirements.txt

@@ -71,7 +71,7 @@ xlrd==2.0.1
 validators==0.34.0
 psutil
 sentencepiece
-soundfile==0.12.1
+soundfile==0.13.1
 
 opencv-python-headless==4.10.0.84
 rapidocr-onnxruntime==1.3.24