CI: Pin cython on 32bit build (pandas-dev#47889)

* CI: Pin cython on 32bit build

* ==

Author: mroeschke

.github/workflows/32-bit-linux.yml

@@ -38,7 +38,7 @@ jobs:
           /opt/python/cp38-cp38/bin/python -m venv ~/virtualenvs/pandas-dev && \
           . ~/virtualenvs/pandas-dev/bin/activate && \
           python -m pip install --no-deps -U pip wheel 'setuptools<60.0.0' && \
-          pip install cython numpy python-dateutil pytz pytest pytest-xdist pytest-asyncio>=0.17 hypothesis && \
+          pip install cython==0.29.30 numpy python-dateutil pytz pytest pytest-xdist pytest-asyncio>=0.17 hypothesis && \
           python setup.py build_ext -q -j2 && \
           python -m pip install --no-build-isolation --no-use-pep517 -e . && \
           export PANDAS_CI=1 && \