Merge pull request #403 from NannyML/matplotlib-weirdness

Revert Matplotlib pinning changes

Author: nnansters

poetry.lock

@@ -43,8 +43,7 @@ joblib = "^1.1.0"
 category-encoders = "^2.3.0"
 matplotlib = [
     {version="^3.5", python=">=3.7.1,<3.8"},
-    {version="^3.7", python=">=3.8,<3.9"},
-    {version="^3.9", python=">=3.9,<3.12"}
+    {version="^3.7", python=">=3.8,<3.12"}
 ]
 plotly = "^5.6.0"
 scipy = [