downgrade scipy to enable py3.9 support

Author: janfb

pyproject.toml

@@ -38,7 +38,7 @@ dependencies = [
     "pyknos>=0.16.0",
     "pyro-ppl>=1.3.1",
     "scikit-learn",
-    "scipy",
+    "scipy<1.13",
     "tensorboard",
     "torch>=1.13.0",
     "tqdm",