Bump org.junit:junit-bom from 5.11.4 to 5.12.0

Bumps [org.junit:junit-bom](https://github.com/junit-team/junit5) from 5.11.4 to 5.12.0.
- [Release notes](https://github.com/junit-team/junit5/releases)
- [Commits](junit-team/junit-framework@r5.11.4...r5.12.0)

---
updated-dependencies:
- dependency-name: org.junit:junit-bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build.gradle

@@ -57,7 +57,7 @@ dependencies {
     implementation group: 'com.h2database', name: 'h2', version: '1.4.200' // Should match version at GoCD 20.5.0 release, since H2 dont guarantee backward compatiiblity
     implementation group: 'org.postgresql', name: 'postgresql', version: '42.7.5'
 
-    testImplementation platform('org.junit:junit-bom:5.11.4')
+    testImplementation platform('org.junit:junit-bom:5.12.0')
     testImplementation group: "org.junit.jupiter", name: "junit-jupiter-api"
     testRuntimeOnly group: "org.junit.jupiter", name: "junit-jupiter-engine"
     testRuntimeOnly group: 'org.junit.platform', name: 'junit-platform-launcher'