Bump org.jenkins-ci:acceptance-test-harness

Bumps [org.jenkins-ci:acceptance-test-harness](https://github.com/jenkinsci/acceptance-test-harness) from 6504.v878e5b_e776d7 to 6507.vef7dc6b_6f5c4.
- [Release notes](https://github.com/jenkinsci/acceptance-test-harness/releases)
- [Commits](https://github.com/jenkinsci/acceptance-test-harness/commits)

---
updated-dependencies:
- dependency-name: org.jenkins-ci:acceptance-test-harness
  dependency-version: 6507.vef7dc6b_6f5c4
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

ui-tests/pom.xml

@@ -48,7 +48,7 @@
     <dependency>
       <groupId>org.jenkins-ci</groupId>
       <artifactId>acceptance-test-harness</artifactId>
-      <version>6504.v878e5b_e776d7</version>
+      <version>6507.vef7dc6b_6f5c4</version>
     </dependency>
     <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>