Test build on all three platforms after removing latest PyYAML and cython

Author: meprem

setup.py

@@ -29,7 +29,7 @@ def read(*names, **kwargs):
     "tqdm",
     "pydantic",
     "Jinja2",
-    "PyYAML==6.0",
+    "pyyaml",
     "ploomber>=0.14.6",
     "ploomber-core>=0.0.11",
     # sdist is generated using python -m build, so adding this here.
@@ -60,7 +60,6 @@ def read(*names, **kwargs):
     "kfp",
     # to validate argo specs
     "argo-workflows-dsl",
-    "cython",
     # for testing aws (newer versions break)
     # see: https://github.com/spulec/moto/issues/1793
     "moto==1.3.14",