scipy version backoff

scipy 1.15.0 breaks pyttb, pinning to earlier version, need to update moving forward

Author: dmdunla

pyproject.toml

@@ -12,7 +12,7 @@ requires-python = ">=3.9"
 dependencies = [
     "numpy<3.0,>=1.24",
     "numpy_groupies>0.11",
-    "scipy>1.9",
+    "scipy<1.15,>1.9",
     "matplotlib>3.7",
 ]
 
@@ -139,4 +139,4 @@ ignore-words-list = [
     "COO",
     "nd",
     "als",
-]
+]