Temp fix for cython 3.0.0 breaking changes by downgrading to 0.29.36

Author: Surya Kodali

pyproject.toml

@@ -2,5 +2,5 @@
 requires = [
     "setuptools",
     "wheel",
-    "Cython>=0.22"
+    "Cython==0.29.36"
 ]

setup.py

@@ -28,7 +28,7 @@
     url="http://github.com/lucasb-eyer/pydensecrf",
     ext_modules=ext_modules,
     packages=["pydensecrf"],
-    setup_requires=['cython>=0.22'],
+    setup_requires=['cython==0.29.36'],
     classifiers=[
         "Intended Audience :: Developers",
         "License :: OSI Approved :: MIT License",