Add support for Python 3.12, update versions of github actions (#548)

* Add support for Python 3.12

* update actions/upload-artifact to v4

* update actions/checkout to v4

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Base Setup
         uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
@@ -58,7 +58,7 @@ jobs:
           pip uninstall -y "jupyter_scheduler" jupyterlab
 
       - name: Upload extension packages
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: extension-artifacts
           path: dist/jupyter_scheduler*
@@ -70,13 +70,13 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Install Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: '3.9'
           architecture: 'x64'
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4
         with:
           name: extension-artifacts
       - name: Install and Test

.github/workflows/check-release.yml

@@ -15,14 +15,14 @@ jobs:
   check_release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
       - name: Check Release
         uses: jupyter-server/jupyter_releaser/.github/actions/check-release@v2
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: Upload Distributions
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: jupyter-scheduler-releaser-dist-${{ github.run_number }}
           path: .jupyter_releaser_checkout/dist

.github/workflows/e2e-tests.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Base Setup
         uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
@@ -65,7 +65,7 @@ jobs:
 
       - name: Upload Playwright Test report
         if: always()
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: jupyter_scheduler-playwright-tests-linux
           path: |

pyproject.toml

@@ -27,6 +27,7 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
 ]
 dependencies = [
     "jupyter_server>=1.6,<3",