Bump org.mockito:mockito-core from 5.18.0 to 5.20.0 in /service (#365)

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.18.0 to 5.20.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.18.0...v5.20.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-version: 5.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

service/build.gradle

@@ -36,7 +36,7 @@ dependencies {
     implementation 'org.apache.xmlbeans:xmlbeans:4.0.0'
     implementation 'com.rabbitmq.jms:rabbitmq-jms:3.5.0'
 
-    testImplementation 'org.mockito:mockito-core:5.18.0'
+    testImplementation 'org.mockito:mockito-core:5.20.0'
     testImplementation 'org.assertj:assertj-core:3.27.3'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testImplementation 'io.rest-assured:rest-assured:5.5.6'