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

Bumps nginxinc/nginx-unprivileged from `5423958` to `cf998f0`.

---
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:1.27.2-alpine@sha256:5423958b5564efef7e81598b77386988d6ee9f69cce513e51bd4795b194ad2e5
+FROM nginxinc/nginx-unprivileged:1.27.2-alpine@sha256:cf998f0d01644f219ba93374491336bad1b6c964ac975d3e19d2ea81dd8dc526
 
 # Arguments that can be passed at build time
 ARG COMMIT_SHA=unknown