chore(deps): renovate: actions/setup-python to v6

Author: renovate[bot]

.github/workflows/chart-tests.yaml

@@ -28,7 +28,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up Python
-        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
+        uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548 # v6
         with:
           python-version: 3.x