Remove Python 3.9 support

Author: rocky

pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
 requires = [
- "setuptools>=70.0.0", # CVE-2024-38335 recommends this
+ "setuptools",
 	"sympy>=1.11,<1.13",
         "PatternLite",
         "langid",  # replace with a supported newer package, e.g. via spacy
@@ -32,7 +32,7 @@ dependencies = [
         "spacy>=3.4",
         "wasabi<1.1.0,>=0.8.2",
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 readme = "README.rst"
 license = {text = "GPL"}
 keywords = ["Mathematica", "Wolfram", "Interpreter", "Shell", "Math", "CAS"]
@@ -44,7 +44,6 @@ classifiers = [
     "Intended Audience :: Science/Research",
     "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",