chore(deps): update helm release cloudnative-pg to v0.21.0 (#457)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [cloudnative-pg](https://cloudnative-pg.io) ([source](https://github.com/cloudnative-pg/charts)) | minor | `0.20.2` -> `0.21.0` |

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### Release Notes

<details>
<summary>cloudnative-pg/charts (cloudnative-pg)</summary>

### [`v0.21.0`](https://github.com/cloudnative-pg/charts/releases/tag/cloudnative-pg-v0.21.0)

[Compare Source](cloudnative-pg/charts@cloudnative-pg-v0.20.2...cloudnative-pg-v0.21.0)

CloudNativePG Operator Helm Chart

#### What's Changed

-   feat(cluster): Make roles configurable by [@&#8203;gpothier](https://github.com/gpothier) in cloudnative-pg/charts#247
-   chore(deps): update actions/checkout action to v4.1.3 by [@&#8203;renovate](https://github.com/renovate) in cloudnative-pg/charts#260
-   chore(deps): update helm/kind-action action to v1.10.0 by [@&#8203;renovate](https://github.com/renovate) in cloudnative-pg/charts#261
-   Release cloudnative-pg-v0.21.0 by [@&#8203;github-actions](https://github.com/github-actions) in cloudnative-pg/charts#266

#### New Contributors

-   [@&#8203;gpothier](https://github.com/gpothier) made their first contribution in cloudnative-pg/charts#247

**Full Changelog**: cloudnative-pg/charts@cluster-v0.0.8...cloudnative-pg-v0.21.0

</details>

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Reviewed-on: https://git.internal/nrdufour/home-ops/pulls/457
Co-authored-by: Renovate <[email protected]>
Co-committed-by: Renovate <[email protected]>

kubernetes/main/apps/database/cloudnative-pg/app/helm-release.yaml

@@ -10,7 +10,7 @@ spec:
   chart:
     spec:
       chart: cloudnative-pg
-      version: 0.20.2
+      version: 0.21.0
       sourceRef:
         kind: HelmRepository
         name: cloudnative-pg