Use jenkins.baseline to reduce bom update mistakes (#654)

pom.xml

@@ -36,7 +36,9 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
-        <jenkins.version>2.440.3</jenkins.version>
+        <!-- https://www.jenkins.io/doc/developer/plugin-development/choosing-jenkins-baseline/ -->
+        <jenkins.baseline>2.440</jenkins.baseline>
+        <jenkins.version>${jenkins.baseline}.3</jenkins.version>
         <node.version>20.17.0</node.version>
         <npm.version>10.8.2</npm.version>
         <hpi.compatibleSinceVersion>391.v252da_e1dd39c</hpi.compatibleSinceVersion>
@@ -247,7 +249,7 @@
         <dependencies>
             <dependency>
                 <groupId>io.jenkins.tools.bom</groupId>
-                <artifactId>bom-2.440.x</artifactId>
+                <artifactId>bom-${jenkins.baseline}.x</artifactId>
                 <version>3435.v238d66a_043fb_</version>
                 <scope>import</scope>
                 <type>pom</type>