fix(helm): update chart cloudnative-pg to 0.21.5 (#241)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [cloudnative-pg](https://cloudnative-pg.io)
([source](https://togithub.com/cloudnative-pg/charts)) | patch |
`0.21.2` -> `0.21.5` |

---

### Release Notes

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

###
[`v0.21.5`](https://togithub.com/cloudnative-pg/charts/releases/tag/cloudnative-pg-v0.21.5)

[Compare
Source](https://togithub.com/cloudnative-pg/charts/compare/cloudnative-pg-v0.21.4...cloudnative-pg-v0.21.5)

CloudNativePG Operator Helm Chart

#### What's Changed

- chore(deps): update actions/checkout action to v4.1.7 by
[@&#8203;renovate](https://togithub.com/renovate) in
[https://github.com/cloudnative-pg/charts/pull/318](https://togithub.com/cloudnative-pg/charts/pull/318)
- Release cloudnative-pg-v0.21.5 by
[@&#8203;github-actions](https://togithub.com/github-actions) in
[https://github.com/cloudnative-pg/charts/pull/315](https://togithub.com/cloudnative-pg/charts/pull/315)

**Full Changelog**:
cloudnative-pg/charts@cloudnative-pg-v0.21.4...cloudnative-pg-v0.21.5

###
[`v0.21.4`](https://togithub.com/cloudnative-pg/charts/releases/tag/cloudnative-pg-v0.21.4)

[Compare
Source](https://togithub.com/cloudnative-pg/charts/compare/cloudnative-pg-v0.21.3...cloudnative-pg-v0.21.4)

CloudNativePG Operator Helm Chart

#### What's Changed

- fix additionalEnv typo in deployment.yaml by
[@&#8203;Stevenpc3](https://togithub.com/Stevenpc3) in
[https://github.com/cloudnative-pg/charts/pull/305](https://togithub.com/cloudnative-pg/charts/pull/305)

**Full Changelog**:
cloudnative-pg/charts@cloudnative-pg-v0.21.3...cloudnative-pg-v0.21.4

###
[`v0.21.3`](https://togithub.com/cloudnative-pg/charts/releases/tag/cloudnative-pg-v0.21.3)

[Compare
Source](https://togithub.com/cloudnative-pg/charts/compare/cloudnative-pg-v0.21.2...cloudnative-pg-v0.21.3)

CloudNativePG Operator Helm Chart

#### What's Changed

- Add 'additionalEnvVars' to the chart by
[@&#8203;Stevenpc3](https://togithub.com/Stevenpc3) in
[https://github.com/cloudnative-pg/charts/pull/303](https://togithub.com/cloudnative-pg/charts/pull/303)

#### New Contributors

- [@&#8203;Stevenpc3](https://togithub.com/Stevenpc3) made their first
contribution in
[https://github.com/cloudnative-pg/charts/pull/303](https://togithub.com/cloudnative-pg/charts/pull/303)

**Full Changelog**:
cloudnative-pg/charts@cloudnative-pg-v0.21.2...cloudnative-pg-v0.21.3

</details>

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kubernetes/apps/datastore/cloudnative-pg/app/helmrelease.yaml

@@ -9,7 +9,7 @@ spec:
   chart:
     spec:
       chart: cloudnative-pg
-      version: 0.21.2
+      version: 0.21.5
       sourceRef:
         kind: HelmRepository
         name: cloudnative-pg