Bump postgresql from 42.2.15 to 42.2.16

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.2.15 to 42.2.16.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.2.15...REL42.2.16)

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

Author: dependabot[bot]

pom.xml

@@ -269,7 +269,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.2.15</version>
+      <version>42.2.16</version>
       <scope>test</scope>
     </dependency>
   </dependencies>