Document that you need to build with Java 25 for buildpack build-image Graal support

Closes gh-45501

documentation/spring-boot-docs/src/docs/antora/modules/how-to/pages/native-image/developing-your-first-application.adoc

@@ -37,6 +37,8 @@ NOTE: The CNB builder used for the images is `paketobuildpacks/builder-noble-jav
 It has a small footprint and reduced attack surface. It does not include a shell and contains a reduced set of system libraries.
 If you need more tools in the resulting image, you can use `paketobuildpacks/ubuntu-noble-run:latest` as the *run* image.
 
+NOTE: You have to build your application with at least JDK 25, because Buildpacks use the same GraalVM native-image version as the Java version used for compilation.
+
 
 
 [[howto.native-image.developing-your-first-application.buildpacks.system-requirements]]

documentation/spring-boot-docs/src/docs/antora/modules/reference/pages/packaging/native-image/advanced-topics.adoc

@@ -56,6 +56,7 @@ NOTE: Your executable jar must include AOT generated assets such as generated cl
 Spring Boot applications usually use Cloud Native Buildpacks through the Maven (`mvn spring-boot:build-image`) or Gradle (`gradle bootBuildImage`) integrations.
 You can, however, also use {url-buildpacks-docs}/for-platform-operators/how-to/integrate-ci/pack/[`pack`] to turn an AOT processed Spring Boot executable jar into a native container image.
 
+NOTE: You have to build your application with at least JDK 25, because Buildpacks use the same GraalVM native-image version as the Java version used for compilation.
 
 First, make sure that a Docker daemon is available (see https://docs.docker.com/installation/#installation[Get Docker] for more details).
 https://docs.docker.com/engine/install/linux-postinstall/#manage-docker-as-a-non-root-user[Configure it to allow non-root user] if you are on Linux.