How to automatically keep in sync with spring boot version

Is your feature request related to a problem? Please describe.
It is a tedious to make sure that the selected cloud stream version and the spring boot version are kept in sync. This also shows in the amount of questions about compatability that are asked in this project.

Describe the solution you'd like
A) manage spring cloud stream version as part of the spring boot dependencies bom:
https://github.com/spring-projects/spring-boot/blob/main/spring-boot-project/spring-boot-dependencies/build.gradle

B) create a new spring overarching dependencies bom that includes the spring boot dependencies bom as well as spring cloud dependencies

C) align version numbers so they can be shares as a single variable

D) add a spring cloud bom that is more strict about dependency resolution so it fails on its own when conflicting versions are used

Describe alternatives you've considered
Turning off renovate upgrades for spring cloudstream and manually applying them to spring boot upgrade PRs

Additional context

The issue points to spring-boot-project/spring-boot-dependencies/build.gradle; start there and review how Spring Cloud Stream and Spring Boot versions are currently managed. Compare the four proposed BOM and version-alignment options with the Renovate alternative. Done means an agreed approach that keeps versions compatible or fails clearly when conflicts occur.