Bump io.jenkins.tools.bom:bom-2.504.x

Bumps [io.jenkins.tools.bom:bom-2.504.x](https://github.com/jenkinsci/bom) from 5659.vecf9e2dc5a_ed 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
...

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

Author: dependabot[bot]

pom.xml

@@ -81,7 +81,7 @@
       <dependency>
         <groupId>io.jenkins.tools.bom</groupId>
         <artifactId>bom-${jenkins.baseline}.x</artifactId>
-        <version>5659.vecf9e2dc5a_ed</version>
+        <version>5723.v6f9c6b_d1218a_</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>