chore: pin cython

Author: Vladimir Puzakov

.github/workflows/tests-and-linters.yml

@@ -32,7 +32,7 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: 3.12
-      - run: pip install tox cython<3
+      - run: pip install tox "cython<3"
       - run: make cythonize
       - run: tox
         env: