Add Python 3.11 to lint workflow and check sync/async compatibility

Author: pangpang20

.github/workflows/lint.yml

@@ -20,18 +20,30 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-python@v5
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v5
         with:
           python-version: "3.9"
 
       - name: install packages to tests
         run: |
           pip install ./psycopg[dev,test]
           pip install types-polib
+          pip install pre-commit
 
       - name: Lint codebase
         run: pre-commit run -a --color=always
 
+      - name: Set up Python 3.11
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Install packages for async_to_sync
+        run: |
+            pip install ./psycopg[dev,test]
+            pip install types-polib
+
       - name: Check for sync/async inconsistencies
         run: ./tools/async_to_sync.py --check $(find tests -name "*_async.py" -type f ! -path "tests/pq/test_async.py")