Bump postgresql from 42.2.8 to 42.2.9 in /modules/junit-jupiter

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.2.8 to 42.2.9.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.2.8...REL42.2.9)

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

modules/junit-jupiter/build.gradle

@@ -13,7 +13,7 @@ dependencies {
         exclude(module: 'hamcrest-core')
     }
 
-    testRuntime 'org.postgresql:postgresql:42.2.8'
+    testRuntime 'org.postgresql:postgresql:42.2.9'
     testRuntime 'mysql:mysql-connector-java:8.0.18'
     testRuntime 'org.junit.jupiter:junit-jupiter-engine:5.5.2'
 }