chore(deps): Bump cython from 3.2.5 to 3.2.8 in /tests

Bumps [cython](https://github.com/cython/cython) from 3.2.5 to 3.2.8.
- [Release notes](https://github.com/cython/cython/releases)
- [Changelog](https://github.com/cython/cython/blob/master/CHANGES.rst)
- [Commits](cython/cython@3.2.5...3.2.8)

---
updated-dependencies:
- dependency-name: cython
  dependency-version: 3.2.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

tests/requirements.colab.2024.02.txt

@@ -7,7 +7,7 @@
 #     if pkg in dep:
 #         print(f"- {pkg} = {ver}")
 
-Cython==3.2.5
+Cython==3.2.8
 graphviz==0.21
 jupyter-client==8.8.0
 jupyter-console==6.6.3

tests/requirements.colab.2025.02.txt

@@ -7,7 +7,7 @@
 #     if pkg in dep:
 #         print(f"- {pkg} = {ver}")
 
-Cython==3.2.5
+Cython==3.2.8
 graphviz==0.21
 html5lib==1.1
 ipywidgets==8.1.8

tests/requirements.colab.2026.02.txt

@@ -7,7 +7,7 @@
 #     if pkg in dep:
 #         print(f"- {pkg} = {ver}")
 
-Cython==3.2.5
+Cython==3.2.8
 graphviz==0.21
 html5lib==1.1
 ipywidgets==8.1.8