build(deps): bump org.postgresql:postgresql in /modules/gs-user (#859)

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.3 to 42.7.4.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.7.3...REL42.7.4)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

modules/gs-user/build.gradle

@@ -33,7 +33,7 @@ dependencies {
  implementation group: 'io.opentracing.contrib', name: 'opentracing-spring-jaeger-web-starter', version: '3.3.1'
  implementation group: 'org.springframework.boot', name: 'spring-boot-starter-data-rest', version: "$springBootVersion"
  implementation group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa', version: "$springBootVersion"
- implementation group: 'org.postgresql', name: 'postgresql', version: '42.7.3'
+ implementation group: 'org.postgresql', name: 'postgresql', version: '42.7.4'
  testImplementation group: 'com.h2database', name: 'h2', version: '2.2.224'
 
  implementation 'org.springframework.boot:spring-boot-starter-actuator'