chore(deps): update actions/setup-python action to v5.6.0

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -14,7 +14,7 @@ jobs:
         with: # for gitlint
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
-      - uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
         with:
           python-version: ">=3.7"
           cache: pip