⬆️ Bump ruby in /containers/docker

Bumps ruby from 3.4.7-alpine to 4.0.0-alpine.

---
updated-dependencies:
- dependency-name: ruby
  dependency-version: 4.0.0-alpine
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

containers/docker/Dockerfile

@@ -2,7 +2,7 @@
 ARG BUNDLE_WITHOUT=development:test
 ARG BUNDLE_DEPLOYMENT=true
 
-FROM ruby:3.4.7-alpine AS build-env
+FROM ruby:4.0.0-alpine AS build-env
 
 # include global args
 ARG BUNDLE_WITHOUT
@@ -77,7 +77,7 @@ RUN rm -rf tmp/cache tmp/pids tmp/sockets app/assets/images/features
 
 ################## Build done ##################
 
-FROM ruby:3.4.7-alpine
+FROM ruby:4.0.0-alpine
 
 # include global args
 ARG BUNDLE_WITHOUT