Removed 1 unnecessary stubbings in ChangesSinceLastUnstableBuildMacroTest.java

[ARUS2023]

Testing done

### Submitter checklist
- [x] Make sure you are opening from a **topic/feature/bugfix branch** (right side) and not your main branch!
- [x] Ensure that the pull request title represents the desired changelog entry
- [x] Please describe what you did
- [ ] Link to relevant issues in GitHub or Jira
- [ ] Link to relevant pull requests, esp. upstream and downstream changes
- [ ] Ensure you have provided tests - that demonstrates feature works or fixes the issue

In our previous pull request #196, we forgot to remove one unnecessary stubbing in the method createBuild. We are submitting this pull request to remove that. Sorry we did not submit all of them at one.