Outdated dependencies CI job

.github/workflows/outdated_dependencies.yaml

@@ -0,0 +1,20 @@
+name: List outdated dependencies
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  list_outdated_dependencies:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - name: Check Python version
+        run: python --version
+      - name: PDM installation
+        run: pip install --user pdm
+      - name: List outdated dependencies
+        run: pdm outdated