chore(deps): update actions/setup-python action to v7

Author: renovate[bot]

.github/workflows/integration_test_app.yaml

@@ -40,7 +40,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6.0.2
       - uses: canonical/setup-lxd@v0.1.3
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@v7
         with:
           python-version: "3.14"
       - name: Install tox