chore(deps): update helm/chart-testing-action action to v2.4.0

Author: renovate[bot]

.github/workflows/pr-chart.yaml

@@ -21,7 +21,7 @@ jobs:
           python-version: 3.7
 
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@afea100a513515fbd68b0e72a7bb0ae34cb62aec #v2.3.1
+        uses: helm/chart-testing-action@e8788873172cb653a90ca2e819d79d65a66d4e76 # v2.4.0
 
       - name: Run chart-testing (list-changed)
         id: list-changed