build(deps): bump nginxinc/nginx-unprivileged in /docker

Bumps nginxinc/nginx-unprivileged from `5b49ce2` to `7b43166`.

---
updated-dependencies:
- dependency-name: nginxinc/nginx-unprivileged
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

docker/Dockerfile.alpine

@@ -1,4 +1,4 @@
-FROM nginxinc/nginx-unprivileged:1.25.4-alpine@sha256:5b49ce26ad8555b649a5a5ea8ccdfabc742a284ab58cb7b7d7a56f178c5dd351
+FROM nginxinc/nginx-unprivileged:1.25.4-alpine@sha256:7b4316677e4015a53d326e657915340128d9fd506f826f676d9f169c0c8557f6
 
 # Arguments that can be passed at build time
 ARG COMMIT_SHA=unknown