chore(deps): update container image nginx to 1.27.0@81dbf3e by renovate (#25059)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| nginx | digest | `6af79ae` -> `81dbf3e` |

---

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

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **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
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Renovate
Bot](https://togithub.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC4yNi4wIiwidXBkYXRlZEluVmVyIjoiMzguMjYuMCIsInRhcmdldEJyYW5jaCI6Im1hc3RlciIsImxhYmVscyI6WyJhdXRvbWVyZ2UiLCJ1cGRhdGUvZG9ja2VyL2dlbmVyYWwvbm9uLW1ham9yIl19-->

charts/stable/vikunja/Chart.yaml

@@ -41,4 +41,4 @@ sources:
   - https://hub.docker.com/r/vikunja/frontend
   - https://vikunja.io/docs
 type: application
-version: 15.2.3
+version: 15.2.4

charts/stable/vikunja/values.yaml

@@ -8,7 +8,7 @@ frontendImage:
   pullPolicy: IfNotPresent
 nginxImage:
   repository: nginx
-  tag: 1.27.0@sha256:6af79ae5de407283dcea8b00d5c37ace95441fd58a8b1d2aa1ed93f5511bb18c
+  tag: 1.27.0@sha256:81dbf3ecf1120d90ace4593096bb650a2d11d4a11d24c3aaea5bef7c9bbb2c88
 workload:
   main:
     podSpec: