chore(deps): update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/deploy-docs.yml

@@ -23,7 +23,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.12'