Bump org.apache.kafka:kafka_2.12 from 2.2.0 to 2.6.3

Bumps org.apache.kafka:kafka_2.12 from 2.2.0 to 2.6.3.

---
updated-dependencies:
- dependency-name: org.apache.kafka:kafka_2.12
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pom.xml

@@ -74,7 +74,7 @@
         <tminglei.version>0.19.6</tminglei.version>
         <slick-hikaricp.version>3.3.1</slick-hikaricp.version>
         <postgresql>42.5.1</postgresql>
-        <kafka.version>2.2.0</kafka.version>
+        <kafka.version>2.6.3</kafka.version>
         <embedded.kafka.version>2.2.0</embedded.kafka.version>
         <commons.configuration2.version>2.8.0</commons.configuration2.version>
         <play-json.version>2.7.3</play-json.version>