try the cython rc

Author: lithomas1

pyproject.toml

@@ -5,7 +5,7 @@ requires = [
     "meson-python>=0.13.1",
     "meson>=1.2.1,<2",
     "wheel",
-    "Cython~=3.0.5",  # Note: sync with setup.py, environment.yml and asv.conf.json
+    "Cython==3.1.0rc1",  # Note: sync with setup.py, environment.yml and asv.conf.json
     # Force numpy higher than 2.0rc1, so that built wheels are compatible
     # with both numpy 1 and 2
     "numpy>=2.0.0rc1",