Update third-party actions in "pytest" CI workflow

- Bump ts-graphviz/setup-graphviz v1 → v2
- Inline pre-commit action

.github/workflows/pytest.yaml

@@ -57,7 +57,7 @@ jobs:
         cache: pip
         cache-dependency-path: "**/pyproject.toml"
 
-    - uses: ts-graphviz/setup-graphviz@v1
+    - uses: ts-graphviz/setup-graphviz@v2
       with:
         macos-skip-brew-update: true
 
@@ -82,15 +82,17 @@ jobs:
 
     runs-on: ubuntu-latest
 
+    steps:
     steps:
     - uses: actions/checkout@v4
     - uses: actions/setup-python@v5
+      with: { python-version: 3.x }
+    - run: python -m pip install pre-commit && python -m pip freeze --local
+    - uses: actions/cache@v4
       with:
-        python-version: "3.x"
-
+        path: ~/.cache/pre-commit
+        key: pre-commit|${{ env.pythonLocation }}|${{ hashFiles('.pre-commit-config.yaml') }}
     - name: Force recreation of pre-commit virtual environment for mypy
       if: github.event_name == 'schedule'  # Comment this line to run on a PR
-      run: gh cache list -L 999 | cut -f2 | grep pre-commit | xargs -I{} gh cache delete "{}" || true
-      env: { GH_TOKEN: "${{ github.token }}" }
-
-    - uses: pre-commit/[email protected]
+      run: pre-commit clean
+    - run: pre-commit run --all-files --color=always --show-diff-on-failure