Bump the centralized-integration-deps group (#647)

Bumps the centralized-integration-deps group in /centralized-sampling-tests/integration-tests with 1 update: [org.springframework.boot](https://github.com/spring-projects/spring-boot).

- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.7.14...v2.7.15)

---
updated-dependencies:
- dependency-name: org.springframework.boot
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: centralized-integration-deps
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

centralized-sampling-tests/integration-tests/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id 'org.springframework.boot' version '2.7.14'
+    id 'org.springframework.boot' version '2.7.15'
     id 'io.spring.dependency-management' version '1.1.3'
     id 'java'
     id 'java-library'