Merge pull request #26607 from tchaikov/wip-cython-language_level

pybind: set language_level for cythonize explicitly

Reviewed-by: Neha Ojha <nojha@redhat.com>
Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>

diff --cc src/pybind/cephfs/setup.py
Simple merge

diff --cc src/pybind/rados/rados.pyx
Simple merge

diff --cc src/pybind/rados/setup.py
Simple merge

diff --cc src/pybind/rbd/setup.py
Simple merge

diff --cc src/pybind/rgw/setup.py
Simple merge