Change metadata to support Python 3.12

Now that `pystack` publishes 3.12 wheels, `pytest-pystack` should be
able to work with 3.12.

Signed-off-by: Gus Monod <gmonod1@bloomberg.net>

Author: sarahmonod

.github/workflows/validate.yaml

@@ -18,7 +18,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: '3.11'
+        python-version: '3.12-dev'
     - name: Install Python dependencies
       run: |
         python3 -m pip install -r requirements-dev.txt
@@ -34,13 +34,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python_version: ["3.8", "3.9", "3.10", "3.11"]
+        python_version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: ${{ matrix.python_version }}
+        python-version: ${{ matrix.python_version }}-dev
     - name: Install Python dependencies
       run: |
         python${{matrix.python_version}} -m pip install -r requirements-dev.txt

pyproject.toml

@@ -24,6 +24,7 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Framework :: Pytest",
 ]