Bump matrix-project from 1.18 to 1.19 (#5551)

Bumps [matrix-project](https://github.com/jenkinsci/matrix-project-plugin) from 1.18 to 1.19.
- [Release notes](https://github.com/jenkinsci/matrix-project-plugin/releases)
- [Changelog](https://github.com/jenkinsci/matrix-project-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jenkinsci/matrix-project-plugin/compare/matrix-project-1.18...matrix-project-1.19

)

---
updated-dependencies:
- dependency-name: org.jenkins-ci.plugins:matrix-project
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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