Update binwiederhier/ntfy Docker tag to v2.15.0 (#2051)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [binwiederhier/ntfy](https://ntfy.sh/) ([source](https://github.com/binwiederhier/ntfy)) | minor | `v2.14.0` -> `v2.15.0` |

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### Release Notes

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

### [`v2.15.0`](https://github.com/binwiederhier/ntfy/releases/tag/v2.15.0)

[Compare Source](https://github.com/binwiederhier/ntfy/compare/v2.14.0...v2.15.0)

This release adds a `require-login` flag to topics, which forces users to log in before they can use the web app. This is useful for self-hosters and will obviously not be enabled on ntfy.sh.

**Features:**

- Add `require-login` flag to redirect to login page if not logged in ([#&#8203;1434](https://github.com/binwiederhier/ntfy/pull/1434)/[#&#8203;238](https://github.com/binwiederhier/ntfy/issues/238)/[#&#8203;1329](https://github.com/binwiederhier/ntfy/pull/1329), thanks to [@&#8203;theatischbein](https://github.com/theatischbein) for implementing most of this)

**Bug fixes + maintenance:**

- The official ntfy.sh Debian/Ubuntu repository has moved to [archive.ntfy.sh](https://archive.ntfy.sh) ([#&#8203;1357](https://github.com/binwiederhier/ntfy/issues/1357)/[#&#8203;1401](https://github.com/binwiederhier/ntfy/issues/1401), thanks to [@&#8203;skibbipl](https://github.com/skibbipl) and [@&#8203;lduesing](https://github.com/lduesing) for reporting)
- Add mutex around message cache writes to avoid `database locked` errors ([#&#8203;1397](https://github.com/binwiederhier/ntfy/pull/1397), [#&#8203;1391](https://github.com/binwiederhier/ntfy/issues/1391), thanks to [@&#8203;timofej673](https://github.com/timofej673))
- Add build tags `nopayments`, `nofirebase` and `nowebpush` to allow excluding external dependencies, useful for
  packaging in Debian ([#&#8203;1420](https://github.com/binwiederhier/ntfy/pull/1420), discussion in [#&#8203;1258](https://github.com/binwiederhier/ntfy/issues/1258), thanks to [@&#8203;thekhalifa](https://github.com/thekhalifa) for packaging ntfy for Debian/Ubuntu)
- Make copying tokens, phone numbers, etc. possible on HTTP ([#&#8203;1432](https://github.com/binwiederhier/ntfy/pull/1432)/[#&#8203;1408](https://github.com/binwiederhier/ntfy/issues/1408)/[#&#8203;1295](https://github.com/binwiederhier/ntfy/issues/1295), thanks to [@&#8203;EdwinKM](https://github.com/EdwinKM), [@&#8203;xxl6097](https://github.com/xxl6097) for reporting)

</details>

---

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Reviewed-on: https://gitea.alexlebens.dev/alexlebens/infrastructure/pulls/2051
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clusters/cl01tl/platform/ntfy/values.yaml

@@ -9,7 +9,7 @@ ntfy:
         main:
           image:
             repository: binwiederhier/ntfy
-            tag: v2.14.0
+            tag: v2.15.0
             pullPolicy: IfNotPresent
           args: ["serve"]
           env: