Bump postgresql from 42.2.5 to 42.2.8

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.2.5 to 42.2.8.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.2.5...REL42.2.8)

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

Author: dependabot-preview[bot]

pom.xml

@@ -249,7 +249,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.2.5</version>
+      <version>42.2.8</version>
       <scope>test</scope>
     </dependency>
     <dependency>