Bump actions/setup-python from 5 to 6 (#806)

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Author: dependabot[bot]

.github/workflows/ci.yml

@@ -152,7 +152,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.12'