Update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/test.yml

@@ -30,7 +30,7 @@ jobs:
         shellcheck --version && \
         /bin/bash --version && shellcheck -x -e SC2016 -e SC2119 -e SC2129 -e SC2001 -e SC2038 -e SC2044 certstrap/gen_faucetconfrpc_keys.sh
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '>=3.11 <3.13'
     - name: Install Poetry