Update Python range to [3.9, 3.13]

Unfortunately, Python 3.8 does not support setuptools 77.0.0+,
which we "need" for the license field to be a plain string.

Author: ctrueden

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.9", "3.13"]
 
     steps:
     - uses: actions/checkout@v4

pyproject.toml

@@ -22,11 +22,11 @@ classifiers = [
     "Intended Audience :: Education",
     "Intended Audience :: Science/Research",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Operating System :: Microsoft :: Windows",
     "Operating System :: Unix",
     "Operating System :: MacOS",
@@ -38,8 +38,7 @@ classifiers = [
     "Topic :: Utilities",
 ]
 
-# NB: Keep this in sync with environment.yml AND dev-environment.yml!
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [
     "numpy",
     "jpype1 >= 1.3.0",