chore(deps): update helm release cloudnative-pg to v0.21.5 (#59)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [cloudnative-pg](https://cloudnative-pg.io)
([source](https://togithub.com/cloudnative-pg/charts)) | helm_release |
patch | `v0.21.4` -> `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

</details>

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terraform/cnpg/cnpg.tf

@@ -4,7 +4,7 @@ resource "helm_release" "cloudnative_pg" {
   chart            = "cloudnative-pg"
   namespace        = var.namespace
   create_namespace = true
-  version          = "v0.21.4"
+  version          = "0.21.5"
 
   set {
     name  = "monitoring.podMonitorEnabled"