[SAGE] Upgrade Spring Boot to 3.5.x (Latest Stable) #575
Description
As a developer
I want to upgrade the SAGE application to Spring Boot 3.5.x
So that the project benefits from the latest framework improvements, security patches, and compatibility with the latest Java LTS version.
Acceptance Criteria
- Sprint Boot version in pom.xml is updated to 3.5.x.
- All dependencies and plugins are compatible with Spring Boot 3.5.x.
- Deprecated javax.* references are migrated to jakarta.* (if upgrading from Spring Boot 2.x).
- The application builds and runs successfully with no runtime errors or warnings.
- All tests pass successfully after the upgrade.