chore(deps-dev): bump cython from 3.1.4 to 3.2.1

Bumps [cython](https://github.com/cython/cython) from 3.1.4 to 3.2.1.
- [Release notes](https://github.com/cython/cython/releases)
- [Changelog](https://github.com/cython/cython/blob/master/CHANGES.rst)
- [Commits](cython/cython@3.1.4...3.2.1)

---
updated-dependencies:
- dependency-name: cython
  dependency-version: 3.2.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pyproject.toml

@@ -4,7 +4,7 @@ requires = [
 
     # Cython and numpy are needed when running setup.py, to build extensions
     "numpy==2.3.4",
-    "Cython==3.1.4",
+    "Cython==3.2.1",
 ]
 build-backend = "setuptools.build_meta"