CI: Update to actions/setup-python@v5

Author: oyamad

.github/workflows/ci_np2.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v5
       with:
         python-version: '3.13'
         allow-prereleases: true