CI: Update python version in check-helm-chart

Update to the latest python version for the install-helm workflow

Author: b10n1k

.github/workflows/check-helm-chart.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.11
+          python-version: 3.13
 
       - name: Set up chart-testing
         uses: helm/chart-testing-action@v2
@@ -38,7 +38,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.11
+          python-version: 3.13
 
       - name: Set up chart-testing
         uses: helm/chart-testing-action@v2