Update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/publish_to_pypi.yml

@@ -19,7 +19,7 @@ jobs:
       uses: actions/checkout@v5
 
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.14'
 

.github/workflows/run_test.yml

@@ -51,7 +51,7 @@ jobs:
       uses: actions/checkout@v5
 
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
         architecture: ${{ matrix.architecture }}