fix(ci): pin python version (#1212)

Author: trouaux

.github/workflows/helm-lint-test.yaml

@@ -26,8 +26,7 @@ jobs:
 
       - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
-          python-version: "3.x"
-          check-latest: true
+          python-version: "3.13"
           token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up chart-linting and chart-testing