Update to actions/setup-python@v6

This is a required update, because v5 uses a deprecated node.js version.

see ae73230

Author: TimWolla

.github/workflows/deploy.yml

@@ -40,7 +40,7 @@ jobs:
         git config --global user.email "haproxy@formilux.org"
         git config --global gc.autoDetach "false"
     - name: Install Python.
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.x'
     - name: Clone dconv.