Update jenkins-test-harness version to 2419.vef4522a_87b_75

[github-actions]

Update jenkins-test-harness plugin version

Update jenkins-test-harness version in versions.properties

1 file(s) updated with "$1 2419.vef4522a_87b_75": * ./plugin-modernizer-core/src/main/resources/versions.properties

2419.vef4522a_87b_75

<!-- Optional: add a release summary here -->
## 🚀 New features and improvements

* Support the new header (#915) @janfaracik

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