Bump the centralized-spring-docker-deps group across 1 directory with 2 updates

Bumps the centralized-spring-docker-deps group with 2 updates in the /centralized-sampling-tests/sample-apps/spring-boot directory: gradle and amazoncorretto.


Updates `gradle` from 8.6.0-jdk11 to 8.12.1-jdk11

Updates `amazoncorretto` from 21 to 23

---
updated-dependencies:
- dependency-name: gradle
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: centralized-spring-docker-deps
- dependency-name: amazoncorretto
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: centralized-spring-docker-deps
...

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

Author: dependabot[bot]

centralized-sampling-tests/sample-apps/spring-boot/Dockerfile

@@ -1,4 +1,4 @@
-FROM gradle:8.6.0-jdk11 as builder
+FROM gradle:8.12.1-jdk11 as builder
 
 WORKDIR /app
 COPY ./build.gradle ./build.gradle
@@ -12,7 +12,7 @@ ARG VER=1.0
 # assume app is already built since it will not build in docker container
 RUN tar -xvf build/distributions/spring-boot-${VER}.tar
 
-FROM amazoncorretto:21
+FROM amazoncorretto:23
 
 WORKDIR /app
 ARG VER=1.0