chore: bump sam/build-java25

Bumps sam/build-java25 from `bffac7d` to `15e69d9`.

---
updated-dependencies:
- dependency-name: sam/build-java25
  dependency-version: 15e69d9776709e299d2913e546d8d7fb30b9ca0b66e4fce6f3beb41604242bd8
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

powertools-e2e-tests/src/test/resources/docker/Dockerfile

@@ -1,5 +1,5 @@
 # Use the official AWS SAM base image for Java 25
-FROM public.ecr.aws/sam/build-java25@sha256:bffac7de6e418a93d2aefc1e8e7c79eda0971e7a026725fe618b58ddfba7a128
+FROM public.ecr.aws/sam/build-java25@sha256:15e69d9776709e299d2913e546d8d7fb30b9ca0b66e4fce6f3beb41604242bd8
 
 # Install GraalVM dependencies
 RUN curl -4 -L https://download.oracle.com/graalvm/25/latest/graalvm-jdk-25_linux-x64_bin.tar.gz | tar -xvz