fix: remove custom classifier for MPL (#62)

Author: beckermr

pyproject.toml

@@ -30,8 +30,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
-    "Framework :: Matplotlib :: 3.9",
-    # "Framework :: Matplotlib :: 3.10" # add when basemap is updated
+    "Framework :: Matplotlib",
 ]
 dependencies= [
     "numpy>=1.26.0",