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

Bumps [org.jenkins-ci:acceptance-test-harness](https://github.com/jenkinsci/acceptance-test-harness) from 6081.v29b_ce3c2771c to 6107.v8c73fa_b_8f784.
- [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-type: direct:production
...

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

ui-tests/pom.xml

@@ -49,7 +49,7 @@
     <dependency>
       <groupId>org.jenkins-ci</groupId>
       <artifactId>acceptance-test-harness</artifactId>
-      <version>6081.v29b_ce3c2771c</version>
+      <version>6107.v8c73fa_b_8f784</version>
     </dependency>
     <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>