chore(deps): Update helm/chart-testing-action action to v2.4.0 (#292)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [helm/chart-testing-action](https://github.com/helm/chart-testing-action) | action | minor | `v2.3.1` -> `v2.4.0` |

---

### Release Notes

<details>
<summary>helm/chart-testing-action</summary>

### [`v2.4.0`](https://github.com/helm/chart-testing-action/releases/tag/v2.4.0)

[Compare Source](https://github.com/helm/chart-testing-action/compare/v2.3.1...v2.4.0)

#### What's Changed

-   Retry artifact downloads by [@&#8203;steven-sheehy](https://github.com/steven-sheehy) in [https://github.com/helm/chart-testing-action/pull/111](https://github.com/helm/chart-testing-action/pull/111)
-   fix example workflow by [@&#8203;CrowdSalat](https://github.com/CrowdSalat) in [https://github.com/helm/chart-testing-action/pull/115](https://github.com/helm/chart-testing-action/pull/115)
-   docs: only run chart lint if changed by [@&#8203;fty4](https://github.com/fty4) in [https://github.com/helm/chart-testing-action/pull/106](https://github.com/helm/chart-testing-action/pull/106)
-   docs: use GITHUB_OUTPUT in example workflow by [@&#8203;fty4](https://github.com/fty4) in [https://github.com/helm/chart-testing-action/pull/107](https://github.com/helm/chart-testing-action/pull/107)
-   Use cosign to verify the release and update chart-testing to v3.8.0 by [@&#8203;cpanato](https://github.com/cpanato) in [https://github.com/helm/chart-testing-action/pull/116](https://github.com/helm/chart-testing-action/pull/116)

#### New Contributors

-   [@&#8203;steven-sheehy](https://github.com/steven-sheehy) made their first contribution in [https://github.com/helm/chart-testing-action/pull/111](https://github.com/helm/chart-testing-action/pull/111)
-   [@&#8203;CrowdSalat](https://github.com/CrowdSalat) made their first contribution in [https://github.com/helm/chart-testing-action/pull/115](https://github.com/helm/chart-testing-action/pull/115)
-   [@&#8203;fty4](https://github.com/fty4) made their first contribution in [https://github.com/helm/chart-testing-action/pull/106](https://github.com/helm/chart-testing-action/pull/106)

**Full Changelog**: helm/chart-testing-action@v2...v2.4.0

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "before 3am on the first day of the month" (UTC), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNC4xNTQuMCIsInVwZGF0ZWRJblZlciI6IjM0LjE1NC4wIn0=-->

.github/workflows/lint_test.yml

@@ -26,7 +26,7 @@ jobs:
           python-version: 3.7
 
       - name: Set up chart-testing
-        uses: helm/chart-testing-action@v2.3.1
+        uses: helm/chart-testing-action@v2.4.0
 
       - name: Run chart-testing (lint)
         run: make lint