Update Helm release cloudnative-pg to v0.26.0 (#1219)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [cloudnative-pg](https://cloudnative-pg.io) ([source](https://github.com/cloudnative-pg/charts)) | minor | `0.25.0` -> `0.26.0` |

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### Release Notes

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

### [`v0.26.0`](https://github.com/cloudnative-pg/charts/releases/tag/cloudnative-pg-v0.26.0)

[Compare Source](https://github.com/cloudnative-pg/charts/compare/cloudnative-pg-v0.25.0...cloudnative-pg-v0.26.0)

CloudNativePG Operator Helm Chart

#### What's Changed

- chore(deps): update sigstore/cosign-installer action to v3.9.2 by [@&#8203;renovate](https://github.com/renovate)\[bot] in https://github.com/cloudnative-pg/charts/pull/620
- Release cloudnative-pg-v0.26.0 by [@&#8203;github-actions](https://github.com/github-actions)\[bot] in https://github.com/cloudnative-pg/charts/pull/645

**Full Changelog**: https://github.com/cloudnative-pg/charts/compare/cloudnative-pg-v0.25.0...cloudnative-pg-v0.26.0

</details>

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### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

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

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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

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

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
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Reviewed-on: #1219
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/storage/cloudnative-pg/Chart.yaml

@@ -15,7 +15,7 @@ maintainers:
   - name: alexlebens
 dependencies:
   - name: cloudnative-pg
-    version: 0.25.0
+    version: 0.26.0
     repository: https://cloudnative-pg.io/charts/
 icon: https://avatars.githubusercontent.com/u/100373852?s=200&v=4
 appVersion: 1.26.0