chore(deps): update container image nginx to 1.27.0@56b388b by renovate (#23322)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| nginx | digest | `0f04e4f` -> `56b388b` |

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This PR has been generated by [Renovate
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<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy40MDcuNCIsInVwZGF0ZWRJblZlciI6IjM3LjQwNy40IiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImF1dG9tZXJnZSIsInVwZGF0ZS9kb2NrZXIvZ2VuZXJhbC9ub24tbWFqb3IiXX0=-->

charts/stable/vikunja/Chart.yaml

@@ -42,4 +42,4 @@ sources:
   - https://hub.docker.com/r/vikunja/frontend
   - https://vikunja.io/docs
 type: application
-version: 15.0.1
+version: 15.0.2

charts/stable/vikunja/values.yaml

@@ -8,7 +8,7 @@ frontendImage:
   pullPolicy: IfNotPresent
 nginxImage:
   repository: nginx
-  tag: 1.27.0@sha256:0f04e4f646a3f14bf31d8bc8d885b6c951fdcf42589d06845f64d18aec6a3c4d
+  tag: 1.27.0@sha256:56b388b0d79c738f4cf51bbaf184a14fab19337f4819ceb2cae7d94100262de8
 workload:
   main:
     podSpec: