Bump postgresql from 42.4.1 to 42.4.2 in /modules/spock

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.4.1 to 42.4.2.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.4.1...REL42.4.2)

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

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

Author: dependabot[bot]

modules/spock/build.gradle

@@ -15,7 +15,7 @@ dependencies {
     testImplementation 'com.zaxxer:HikariCP:4.0.3'
     testImplementation 'org.apache.httpcomponents:httpclient:4.5.13'
 
-    testRuntimeOnly 'org.postgresql:postgresql:42.4.1'
+    testRuntimeOnly 'org.postgresql:postgresql:42.4.2'
     testRuntimeOnly 'mysql:mysql-connector-java:8.0.30'
 
     testCompileClasspath 'org.jetbrains:annotations:23.0.0'