Bump actions/setup-python from 5 to 6 (#272)

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.github/workflows/docs.yml

@@ -14,7 +14,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.8'