Bump io.jenkins.tools.bom:bom-2.504.x (jenkinsci#135)

Author: dependabot[bot]

pom.xml

@@ -65,7 +65,7 @@
         <!-- Pick up common dependencies for the selected LTS line: https://github.com/jenkinsci/bom#usage -->
         <groupId>io.jenkins.tools.bom</groupId>
         <artifactId>bom-${jenkins.baseline}.x</artifactId>
-        <version>5324.v88b_4300d0dd9</version>
+        <version>5473.vb_9533d9e5d88</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>