chore(deps): Bump org.jetbrains.kotlin:kotlin-reflect

Bumps [org.jetbrains.kotlin:kotlin-reflect](https://github.com/JetBrains/kotlin) from 2.1.20 to 2.1.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.1.20...v2.1.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-reflect
  dependency-version: 2.1.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -52,7 +52,7 @@ kafka-avro-serializer = { module = "io.confluent:kafka-avro-serializer", version
 kafka-clients = "org.apache.kafka:kafka-clients:4.0.0"
 kafka-streams = "org.apache.kafka:kafka-streams:4.0.0"
 kafka-protobuf-serializer = { module = "io.confluent:kafka-protobuf-serializer", version.ref = "io-confluent" }
-kotlin-reflect = "org.jetbrains.kotlin:kotlin-reflect:2.1.20"
+kotlin-reflect = "org.jetbrains.kotlin:kotlin-reflect:2.1.21"
 kotlinx-serialization-core-jvm = "org.jetbrains.kotlinx:kotlinx-serialization-core-jvm:1.8.1"
 lombok = "org.projectlombok:lombok:1.18.38"
 mockito-core = { module = "org.mockito:mockito-core", version.ref = "org-mockito" }