Bump kafkaVersion from 3.6.0 to 7.6.0-ce

Bumps `kafkaVersion` from 3.6.0 to 7.6.0-ce.

Updates `org.apache.kafka:kafka-clients` from 3.6.0 to 7.6.0-ce

Updates `org.apache.kafka:kafka_2.13` from 3.6.0 to 7.6.0-ce

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

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle.kts

@@ -20,7 +20,7 @@ val flywayVersion = "7.5.2"
 val vaultJdbcVersion = "1.3.9"
 val jacksonVersion = "2.16.1"
 val postgresEmbeddedVersion = "1.0.2"
-val kafkaVersion = "3.6.0"
+val kafkaVersion = "7.6.0-ce"
 val avroVersion = "1.11.3"
 val confluentVersion = "7.5.3"
 val brukernotifikasjonerSchemaVersion = "2.5.1"