Require Python 3.9+, test on Python 3.9 and 3.13 (#609)

* Update Python versions in `test.yml`

* Update Python versions in `pyproject.toml`

Author: krassowski

.github/workflows/test.yml

@@ -40,7 +40,7 @@ jobs:
       fail-fast: false
       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
       - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1

pyproject.toml

@@ -14,13 +14,14 @@ classifiers = [
     "Intended Audience :: Science/Research",
     "License :: OSI Approved :: BSD License",
     "Programming Language :: Python",
-    "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",
 ]
 urls = {Homepage = "https://jupyter.org"}
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dynamic = ["version"]
 dependencies = [
     "click",