Bump confluent from 7.6.1 to 7.7.0

Bumps `confluent` from 7.6.1 to 7.7.0.

Updates `io.confluent:kafka-avro-serializer` from 7.6.1 to 7.7.0
- [Commits](confluentinc/schema-registry@v7.6.1...v7.7.0)

Updates `io.confluent:kafka-schema-registry` from 7.6.1 to 7.7.0

---
updated-dependencies:
- dependency-name: io.confluent:kafka-avro-serializer
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.confluent:kafka-schema-registry
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle.kts

@@ -7,7 +7,7 @@ val flywayVersion = "9.22.3"
 val tokenSupportVersion = "3.2.0"
 val mockkVersion = "1.13.11"
 val springMockkVersion = "3.1.1"
-val confluent = "7.6.1"
+val confluent = "7.7.0"
 val isdialogmoteSchema = "1.0.5"
 val jsoupVersion = "1.17.2"
 val logstashVersion = "4.10"