chore(deps): update dependency binwiederhier/ntfy to v2.20.0 (#5160)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [binwiederhier/ntfy](https://github.com/binwiederhier/ntfy) | minor | `2.19.2` → `2.20.0` |
| [binwiederhier/ntfy](https://ntfy.sh/) ([source](https://github.com/binwiederhier/ntfy)) | minor | `v2.19.2` → `v2.20.0` |

---

### Release Notes

<details>
<summary>binwiederhier/ntfy (binwiederhier/ntfy)</summary>

### [`v2.20.0`](https://github.com/binwiederhier/ntfy/releases/tag/v2.20.0)

[Compare Source](https://github.com/binwiederhier/ntfy/compare/v2.19.2...v2.20.0)

This release is another step towards making it possible to help scale ntfy up and out 🔥! With this release, you can store attachments in an S3-compatible object store as an alterative to the directory. See [attachment store](https://docs.ntfy.sh/config/#attachments) for details.

> ⚠️ **Important note:**  With this release, ntfy will take full control over the attachment directory or S3 bucket. Files/objects in the configured `attachment-cache-dir` that match the message ID format (12 chars, matching `^[A-Za-z0-9]{12}$`), and have no entries in the message database will be deleted. **Do not use a directory or S3 bucket as `attachment-cache-dir` that is also used for something else.**
>
> This is a small behavioral change that was necessary because the old logic often left attachments behind and would not clean them up. Unless you have re-used the attachment directory for anything else (which is hopefully never done), this should not affect you at all.

**Features:**

- Add S3-compatible object storage as an alternative [attachment store](https://docs.ntfy.sh/config/#attachments) via `attachment-cache-dir` config option ([#&#8203;1656](https://github.com/binwiederhier/ntfy/pull/1656)/[#&#8203;1672](https://github.com/binwiederhier/ntfy/pull/1672))

**Bug fixes + maintenance:**

- Reject invalid e-mail addresses (e.g. multiple comma-separated recipients) with HTTP 400
- Add OpenRC init service file ([#&#8203;1650](https://github.com/binwiederhier/ntfy/pull/1650), thanks to [@&#8203;ageru](https://github.com/ageru) for the contribution)

</details>

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### Configuration

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🚦 **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 these updates again.

---

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---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
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Reviewed-on: #5160
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/helm/ntfy/Chart.yaml

@@ -20,4 +20,4 @@ dependencies:
     version: 4.6.2
 icon: https://cdn.jsdelivr.net/gh/selfhst/icons/png/ntfy.png
 # renovate: datasource=github-releases depName=binwiederhier/ntfy
-appVersion: 2.19.2
+appVersion: 2.20.0

clusters/cl01tl/helm/ntfy/values.yaml

@@ -9,7 +9,7 @@ ntfy:
         main:
           image:
             repository: binwiederhier/ntfy
-            tag: v2.19.2
+            tag: v2.20.0
             pullPolicy: IfNotPresent
           args: ["serve"]
           env: