Bump kafkaVersion from 3.7.1 to 3.8.0 (#534)

Bumps `kafkaVersion` from 3.7.1 to 3.8.0.

Updates `org.apache.kafka:kafka-clients` from 3.7.1 to 3.8.0

Updates `org.apache.kafka:kafka_2.13` from 3.7.1 to 3.8.0

---
updated-dependencies:
- dependency-name: org.apache.kafka:kafka-clients
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.kafka:kafka_2.13
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle.kts

@@ -20,7 +20,7 @@ val hikariVersion = "5.1.0"
 val flywayVersion = "10.15.2"
 val vaultJdbcVersion = "1.3.9"
 val jacksonVersion = "2.17.1"
-val kafkaVersion = "3.7.1"
+val kafkaVersion = "3.8.0"
 val brukernotifikasjonerBuilderVersion = "1.0.4"
 val kotlinVersion = "2.0.10"