Fix invalid caching in github workflow (CloudPirates-io#361)

Author: zOnlyKroks

.github/workflows/pull-request.yaml

@@ -38,7 +38,6 @@ jobs:
         uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5.5.0
         with:
           python-version: 3.x
-          cache: 'pip'
 
       - name: Set up chart-testing-action
         uses: helm/chart-testing-action@0d28d3144d3a25ea2cc349d6e59901c4ff469b3b # v2.7.0