Use setup-python v4 in Github action

Author: cffls

.github/workflows/main.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Install poetry
         run: pipx install poetry
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
           cache: 'poetry'