chore(deps): update container image ghcr.io/ix-ai/smtp to v0.5.6@2e668f4 by renovate (#27502)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [ghcr.io/ix-ai/smtp](https://gitlab.com/ix.ai/smtp) | patch | `v0.5.5`
-> `v0.5.6` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

<details>
<summary>ix.ai/smtp (ghcr.io/ix-ai/smtp)</summary>

### [`v0.5.6`](https://gitlab.com/ix.ai/smtp/tags/v0.5.6)

[Compare Source](https://gitlab.com/ix.ai/smtp/compare/v0.5.5...v0.5.6)

#### Release v0.5.6
 
* d7da985 Add opencontainers labels
* 77d073a Update registry.gitlab.com/ix.ai/smtp Docker digest to 56f3c12

</details>

---

### Configuration

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♻ **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
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This PR has been generated by [Renovate
Bot](https://redirect.github.com/renovatebot/renovate).

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Co-authored-by: alfi0812 <43101280+alfi0812@users.noreply.github.com>

charts/stable/smtp-relay/Chart.yaml

@@ -6,7 +6,7 @@ annotations:
   truecharts.org/min_helm_version: "3.11"
   truecharts.org/train: stable
 apiVersion: v2
-appVersion: 0.5.5
+appVersion: 0.5.6
 dependencies:
   - name: common
     version: 25.0.0
@@ -33,4 +33,4 @@ sources:
   - https://github.com/ix-ai/smtp
   - https://github.com/truecharts/charts/tree/master/charts/stable/smtp-relay
 type: application
-version: 5.2.0
+version: 5.2.1

charts/stable/smtp-relay/values.yaml

@@ -1,7 +1,7 @@
 image:
   repository: ghcr.io/ix-ai/smtp
   pullPolicy: IfNotPresent
-  tag: v0.5.5@sha256:56f3c128ddb9ad12237b6777316875abe8d93d7219d84622723155bf17484b6d
+  tag: v0.5.6@sha256:2e668f4b254865c8c02a8ccfcf88b4b2d65a96fbcc4e1b45ca7e83ca26acc9fc
 
 securityContext:
   container: