Bump org.springframework.kafka:spring-kafka-bom from 3.2.7 to 3.2.8 (#9919)

Bumps [org.springframework.kafka:spring-kafka-bom](https://github.com/spring-projects/spring-kafka) from 3.2.7 to 3.2.8.
- [Release notes](https://github.com/spring-projects/spring-kafka/releases)
- [Commits](https://github.com/spring-projects/spring-kafka/compare/v3.2.7...v3.2.8)

---
updated-dependencies:
- dependency-name: org.springframework.kafka:spring-kafka-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -112,7 +112,7 @@ ext {
     springAmqpVersion = '3.1.9'
     springDataVersion = '2024.0.10'
     springGraphqlVersion = '1.3.4'
-    springKafkaVersion = '3.2.7'
+    springKafkaVersion = '3.2.8'
     springRetryVersion = '2.0.11'
     springSecurityVersion = '6.3.8'
     springVersion = '6.1.18'