Update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/pypi-publish.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.x'
     - name: Install dependencies

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
     - name: Set up Python 3.10
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: "3.13"
     - name: Install dependencies