Bump jenkins-test-harness from 1546.ve14c168c8a57 to 1565.v51970ebd7896 (#5530)

Bumps [jenkins-test-harness](https://github.com/jenkinsci/jenkins-test-harness) from 1546.ve14c168c8a57 to 1565.v51970ebd7896.
- [Release notes](https://github.com/jenkinsci/jenkins-test-harness/releases)
- [Commits](https://github.com/jenkinsci/jenkins-test-harness/commits

)

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