chore(deps): update ghcr.io/jeboehm/fetchmailmgr docker tag to v0.3.8 (#54)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[ghcr.io/jeboehm/fetchmailmgr](https://redirect.github.com/jeboehm/fetchmailmgr)
| patch | `0.3.7` -> `0.3.8` |

---

### Release Notes

<details>
<summary>jeboehm/fetchmailmgr (ghcr.io/jeboehm/fetchmailmgr)</summary>

###
[`v0.3.8`](https://redirect.github.com/jeboehm/fetchmailmgr/releases/tag/v0.3.8)

[Compare
Source](https://redirect.github.com/jeboehm/fetchmailmgr/compare/v0.3.7...v0.3.8)

#####
[0.3.8](https://redirect.github.com/jeboehm/fetchmailmgr/compare/v0.3.7...v0.3.8)
(2025-04-24)

</details>

---

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rebase/retry checkbox.

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---

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---

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charts/docker-mailserver/values.yaml

@@ -1293,7 +1293,7 @@ fetchmail:
   image:
     registry: ghcr.io
     repository: jeboehm/fetchmailmgr
-    tag: 0.3.7
+    tag: 0.3.8
     ## Specify a imagePullPolicy
     ## ref: https://kubernetes.io/docs/concepts/containers/images/#pre-pulled-images
     ##