build: add Python 3.13 to CI matrix and classifiers

Add Python 3.13 to the GitHub Actions test matrix so CI runs on both
3.12 and 3.13. Add the 3.13 classifier to pyproject.toml.

Part of PyAutoLabs/PyAutoConf#89.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

.github/workflows/main.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.12']
+        python-version: ['3.12', '3.13']
     steps:
     - name: Checkout PyAutoConf
       uses: actions/checkout@v2
@@ -36,7 +36,10 @@ jobs:
         pip3 install setuptools
         pip3 install wheel
         pip3 install pytest coverage pytest-cov
-        pip install ./PyAutoConf "./PyAutoArray[optional]"
+        pip install ./PyAutoConf ./PyAutoArray
+        if [ "${{ matrix.python-version }}" = "3.12" ]; then
+          pip install "./PyAutoArray[optional]"
+        fi
 
     - name: Extract branch name
       shell: bash

pyproject.toml

@@ -18,7 +18,8 @@ classifiers = [
   "Topic :: Scientific/Engineering :: Physics",
   "Natural Language :: English",
   "Operating System :: OS Independent",
-  "Programming Language :: Python :: 3.12"
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13"
 ]
 keywords = ["cli"]
 dependencies = [