chore(deps): update dependency binwiederhier/ntfy to v2.20.1 (#5205)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [binwiederhier/ntfy](https://github.com/binwiederhier/ntfy) | patch | `2.20.0` → `2.20.1` |

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### Release Notes

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

### [`v2.20.1`](https://github.com/binwiederhier/ntfy/releases/tag/v2.20.1)

[Compare Source](https://github.com/binwiederhier/ntfy/compare/v2.20.0...v2.20.1)

This is a small bugfix release that only affects high volume S3 backends that struggle with HTTP/2.

**Bug fixes + maintenance:**

- [Attachments](https://docs.ntfy.sh/config/#attachments): Add `disable_http2=true` S3 URL option to work around HTTP/2 stream errors with DigitalOcean Spaces and other S3-compatible providers ([#&#8203;1678](https://github.com/binwiederhier/ntfy/issues/1678)/[#&#8203;1679](https://github.com/binwiederhier/ntfy/pull/1679))

</details>

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### Configuration

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♻ **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 this update again.

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Reviewed-on: https://gitea.alexlebens.dev/alexlebens/infrastructure/pulls/5205
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: 2.20.0
+appVersion: 2.20.1