Build(deps): Bump cython from 0.29.21 to 3.0.8

Bumps [cython](https://github.com/cython/cython) from 0.29.21 to 3.0.8.
- [Release notes](https://github.com/cython/cython/releases)
- [Changelog](https://github.com/cython/cython/blob/master/CHANGES.rst)
- [Commits](cython/cython@0.29.21...3.0.8)

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

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

requirements_dev.txt

@@ -11,7 +11,7 @@ Click>=7.0
 cocotb==1.8.0
 cookiecutter
 coverage
-cython==0.29.21
+cython==3.0.8
 femwell==0.1.8
 flake8
 kfactory[git,ipy]==0.7.5

setup.py

@@ -10,7 +10,7 @@
 requirements = [
     # "amaranth",  # Until they sort out their packaging issue, this dependency has to be installed separately. .
     "amaranth-yosys==0.25.0.0.post75",
-    "cython==0.29.21",
+    "cython==3.0.8",
     "jupytext==1.15.0",
     "Click>=7.0",
     "cocotb==1.8.0",