Bump org.testcontainers:kafka from 1.20.2 to 1.20.3 (#554)

Bumps [org.testcontainers:kafka](https://github.com/testcontainers/testcontainers-java) from 1.20.2 to 1.20.3.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.2...1.20.3)

---
updated-dependencies:
- dependency-name: org.testcontainers:kafka
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

pom.xml

@@ -58,7 +58,7 @@
       <dependency>
         <groupId>org.testcontainers</groupId>
         <artifactId>kafka</artifactId>
-        <version>1.20.2</version>
+        <version>1.20.3</version>
       </dependency>
 
       <dependency>