Bump org.apache.flink:flink-connector-kafka

Bumps [org.apache.flink:flink-connector-kafka](https://github.com/apache/flink-connector-kafka) from 3.2.0-1.18 to 3.4.0-1.20.
- [Commits](https://github.com/apache/flink-connector-kafka/commits)

---
updated-dependencies:
- dependency-name: org.apache.flink:flink-connector-kafka
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

flink-jar-runner/pom.xml

@@ -380,7 +380,7 @@
       <properties>
         <flink.version>1.18.1</flink.version>
         <jdbc.version>3.2.0-1.18</jdbc.version>
-        <kafka.version>3.2.0-1.18</kafka.version>
+        <kafka.version>3.4.0-1.20</kafka.version>
         <flink-base-image>1.18.1-scala_2.12-java11</flink-base-image>
       </properties>