CAM-10721, we built automatic update of a license key from file system once it is expired. We decided to not build this for the mechanism in Spring Boot, because the CE spring boot starter cannot have a dependency to the EE license check, which is required to tell if a license is expired.
To expose this feature also in Spring Boot Starter, we can evaluate if we can move the logic of importing the license into the webapp-ee starter, where the license check is available. We should evaluate if we lose any use cases where the webapp-ee starter is not used. Alternatively, we can only implement the auto-update logic in the webapp-ee starter. If we move the entire logic, the change should be documented in the migration guide.