Bump springKafkaVersion from 2.7.8 to 2.8.2

Bumps `springKafkaVersion` from 2.7.8 to 2.8.2.

Updates `spring-kafka` from 2.7.8 to 2.8.2
- [Release notes](https://github.com/spring-projects/spring-kafka/releases)
- [Commits](spring-projects/spring-kafka@v2.7.8...v2.8.2)

Updates `spring-kafka-test` from 2.7.8 to 2.8.2
- [Release notes](https://github.com/spring-projects/spring-kafka/releases)
- [Commits](spring-projects/spring-kafka@v2.7.8...v2.8.2)

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

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

vividus-plugin-kafka/build.gradle

@@ -1,6 +1,6 @@
 project.description = 'Vividus plugin for Apache Kafka'
 
-ext.springKafkaVersion = '2.7.8'
+ext.springKafkaVersion = '2.8.2'
 
 dependencies {
     api project(':vividus-engine')