Upgrade to Spring Boot 4.0.3, Java 25, Gradle 9.3.1 and modernize codebase#114

dcaron wants to merge 2 commits intocloudfoundry-samples:mastercloudfoundry-samples/spring-music:masterfrom

dcaron:upgrade-spring-boot-4-java-25dcaron/spring-music:upgrade-spring-boot-4-java-25Copy head branch name to clipboard