fix(ci): Update Python version for Helm CI (#15420)

This PR resolves failing ci, python 3.7 is deprecated and not supported in ubuntu 24.04.

Author: GVengelen

.github/workflows/helm-ci.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.7
+          python-version: 3.13
 
       - name: Set up chart-testing
         uses: helm/chart-testing-action@v2.6.1