Merge pull request #21426 from opf/bundler-4

Update Ruby & Bundler to v4

docker/dev/backend/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:3.4.7-trixie AS develop
+FROM ruby:4.0.1-trixie AS develop
 LABEL org.opencontainers.image.authors="operations@openproject.com"
 
 ARG DEV_UID=1000

docker/prod/Dockerfile

@@ -1,4 +1,4 @@
-ARG RUBY_VERSION="3.4.7"
+ARG RUBY_VERSION="4.0.1"
 ARG DEBIAN_BASE="trixie"
 # Add SBOM scan context for intermediate steps
 ARG BUILDKIT_SBOM_SCAN_CONTEXT=true