Bump jenkins-test-harness from 2.68 to 2.69

Bumps [jenkins-test-harness](https://github.com/jenkinsci/jenkins-test-harness) from 2.68 to 2.69.
- [Release notes](https://github.com/jenkinsci/jenkins-test-harness/releases)
- [Commits](jenkinsci/jenkins-test-harness@jenkins-test-harness-2.68...jenkins-test-harness-2.69)

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

pom.xml

@@ -53,7 +53,7 @@
     <jenkins.version>2.204</jenkins.version>
     <jenkins-bom.version>${jenkins.version}</jenkins-bom.version>
 
-    <jenkins-test-harness.version>2.68</jenkins-test-harness.version>
+    <jenkins-test-harness.version>2.69</jenkins-test-harness.version>
 
     <hpi-plugin.version>3.16</hpi-plugin.version>
     <stapler-plugin.version>1.17</stapler-plugin.version>