Bump sentencepiece from 0.2.0 to 0.2.1 (#13)

Bumps [sentencepiece](https://github.com/google/sentencepiece) from 0.2.0 to 0.2.1.
- [Release notes](https://github.com/google/sentencepiece/releases)
- [Commits](google/sentencepiece@v0.2.0...v0.2.1)

---
updated-dependencies:
- dependency-name: sentencepiece
  dependency-version: 0.2.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -50,7 +50,7 @@ requests==2.32.4
 safetensors==0.4.3
 scikit-learn==1.5.0
 scipy==1.13.0
-sentencepiece==0.2.0
+sentencepiece==0.2.1
 six==1.16.0
 soundfile==0.12.1
 soxr==0.3.7