Bump actions/setup-python from 3 to 4 (#39)

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.github/workflows/ci.yaml

@@ -21,7 +21,7 @@ jobs:
     timeout-minutes: 60
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/setup-python@v3
+      - uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Get cache dir