Bump python version to 3.7.17

The issue was:
Error: Version 3.7 with arch x64 not found
The list of all available versions can be found here: https://raw.githubusercontent.com/actions/python-versions/main/versions-manifest.json

Author: MaciejKaras

.github/workflows/ci.yaml

@@ -21,7 +21,7 @@ jobs:
 
       - uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.7.17
 
       - name: Set up chart-testing
         uses: helm/[email protected]