Add Python 3.11 to test workflow matrix

.github/workflows/test.yaml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        py_version: ['2.7', '3.9']
+        py_version: ['2.7', '3.9', '3.11']
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
@@ -48,7 +48,7 @@ jobs:
 
       - name: Upload coverage
         uses: codecov/codecov-action@v3.1.1
-        if: ${{ matrix.py_version == '3.9' }}
+        if: ${{ matrix.py_version == '3.11' }}
 
       - name: Publish Test Artifact
         uses: actions/upload-artifact@v3