Bump transformers[sentencepiece] from 4.51.3 to 4.52.3

Bumps [transformers[sentencepiece]](https://github.com/huggingface/transformers) from 4.51.3 to 4.52.3.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v4.51.3...v4.52.3)

---
updated-dependencies:
- dependency-name: transformers[sentencepiece]
  dependency-version: 4.52.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/requirements.txt

@@ -1,7 +1,7 @@
 # Torch dependencies
 torch==2.7.0
 # Huggingface dependencies
-transformers[sentencepiece]==4.51.3
+transformers[sentencepiece]==4.52.3
 diffusers==0.33.1
 datasets==3.5.0
 accelerate==1.5.2