Bump postgresql from 42.5.0 to 42.5.1 in /debezium-server-spark-sinks (#27)

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.5.0 to 42.5.1.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.5.0...REL42.5.1)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:development
...

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debezium-server-spark-sinks/pom.xml

@@ -170,7 +170,7 @@
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
             <scope>test</scope>
-            <version>42.5.0</version>
+            <version>42.5.1</version>
         </dependency>
         <dependency>
             <groupId>io.minio</groupId>