chore(helm): update image docker.io/nginxinc/nginx-unprivileged digest to 7a76302 (#32892)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[docker.io/nginxinc/nginx-unprivileged](https://redirect.github.com/nginxinc/docker-nginx-unprivileged)
| digest | `76fb15a` -> `7a76302` |

Add the preset `:preserveSemverRanges` to your config if you don't want
to pin your dependencies.

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charts/premium/nextcloud/values.yaml

@@ -5,7 +5,7 @@ image:
 nginxImage:
   repository: docker.io/nginxinc/nginx-unprivileged
   pullPolicy: IfNotPresent
-  tag: 1.27.4@sha256:76fb15abad2b5d5f71c5c0de087c364050eb318255797bf855990e36cea24a1c
+  tag: 1.27.4@sha256:7a76302625f26fd9ea82da99c0e14c5f4def3a839b21e4138acdcbefc790219f
 imaginaryImage:
   repository: tccr.io/tccr/nextcloud-imaginary
   pullPolicy: IfNotPresent