Bump io.jenkins.tools.bom:bom-2.504.x (#1841)

Bumps [io.jenkins.tools.bom:bom-2.504.x](https://github.com/jenkinsci/bom) from 5701.va_b_018a_a_6b_0d3 to 5723.v6f9c6b_d1218a_.
- [Release notes](https://github.com/jenkinsci/bom/releases)
- [Commits](https://github.com/jenkinsci/bom/commits)

---
updated-dependencies:
- dependency-name: io.jenkins.tools.bom:bom-2.504.x
  dependency-version: 5723.v6f9c6b_d1218a_
  dependency-type: direct:production
...

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