chore(deps): update helm/chart-testing-action action to v2.8.0 (#122)

| datasource  | package                   | from   | to     |
| ----------- | ------------------------- | ------ | ------ |
| github-tags | helm/chart-testing-action | v2.6.1 | v2.8.0 |

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/lint-test.yaml

@@ -27,7 +27,7 @@ jobs:
           python-version: 3.x
 
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@e6669bcd63d7cb57cb4380c33043eebe5d111992 # v2.6.1
+        uses: helm/chart-testing-action@6ec842c01de15ebb84c8627d2744a0c2f2755c9f # v2.8.0
 
       - name: Run chart-testing (list-changed)
         id: list-changed