chore(nextcloud): update image oci.trueforge.org/containerforge/nginx digest to 53096ab (#44115)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[oci.trueforge.org/containerforge/nginx](https://ghcr.io/trueforge-org/nginx)
([source](https://hub.docker.com/_/nginx)) | digest | `648e1c3` ->
`53096ab` |

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charts/stable/nextcloud/Chart.yaml

@@ -51,5 +51,5 @@ sources:
   - https://hub.docker.com/r/clamav/clamav
   - https://hub.docker.com/r/collabora/code
 type: application
-version: 40.6.14
+version: 40.6.15
 

charts/stable/nextcloud/values.yaml

@@ -5,7 +5,7 @@ image:
 nginxImage:
   repository: oci.trueforge.org/containerforge/nginx
   pullPolicy: IfNotPresent
-  tag: "1.24.0@sha256:648e1c33d1d31bd235f783976375783d2db10399f66250b6b6ab4f9b3d2efcc3"
+  tag: "1.24.0@sha256:53096ab5104128d57235fd02f6dc61f1d87d738d6e3807bdc338518b3f620a74"
 imaginaryImage:
   repository: oci.trueforge.org/containerforge/nextcloud-imaginary
   pullPolicy: IfNotPresent