Log Message:
py-zmq: updated to 26.3.0

pyzmq 26.3 drops support for Python 3.7 and adds wheels for PyPy 3.11

The cffi backend can now be built on CPython by setting `PYZMQ_BACKEND=cffi`, e.g.

```
PYZMQ_BACKEND=cffi pip install --no-binary pyzmq cffi pyzmq
```

This is not fully supported, but can be used for testing.