Bump library/nginx from 1.21.6-alpine to 1.23.0-alpine

Bumps library/nginx from 1.21.6-alpine to 1.23.0-alpine.

---
updated-dependencies:
- dependency-name: library/nginx
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Dockerfile

@@ -210,7 +210,7 @@ RUN echo "deb-src http://nginx.org/packages/mainline/debian/ bullseye nginx" >>
 
 ### Base build image for alpine
 # docker.io/library/nginx is a temporary workaround for Dependabot to see this as different from the one used in Debian
-FROM docker.io/library/nginx:1.21.6-alpine AS build-nginx-alpine
+FROM docker.io/library/nginx:1.23.0-alpine AS build-nginx-alpine
 RUN apk add --no-cache \
     build-base \
     pcre2-dev \
@@ -238,7 +238,7 @@ RUN curl -fsSL -O https://github.com/nginx/nginx/archive/release-${NGINX_VERSION
 
 ### Base image for alpine
 # docker.io/library/nginx is a temporary workaround for Dependabot to see this as different from the one used in Debian
-FROM docker.io/library/nginx:1.21.6-alpine as nginx-alpine
+FROM docker.io/library/nginx:1.23.0-alpine as nginx-alpine
 RUN apk add --no-cache libstdc++