Bump diffusers from 0.31.0 to 0.32.1 in /tests/python_tests

Bumps [diffusers](https://github.com/huggingface/diffusers) from 0.31.0 to 0.32.1.
- [Release notes](https://github.com/huggingface/diffusers/releases)
- [Commits](huggingface/diffusers@v0.31.0...v0.32.1)

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

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

tests/python_tests/requirements.txt

@@ -1,5 +1,5 @@
 --extra-index-url https://download.pytorch.org/whl/cpu
-diffusers==0.31.0
+diffusers==0.32.1
 optimum-intel @ git+https://github.com/huggingface/optimum-intel.git
 numpy<2.0.0; platform_system == "Darwin" and platform_machine == "x86_64"
 onnx==1.17.0