Use jenkins.baseline to reduce bom update mistakes

pom.xml

@@ -55,7 +55,9 @@
 
     <properties>
         <changelist>999999-SNAPSHOT</changelist>
-        <jenkins.version>2.479.1</jenkins.version>
+        <!-- https://www.jenkins.io/doc/developer/plugin-development/choosing-jenkins-baseline/ -->
+        <jenkins.baseline>2.479</jenkins.baseline>
+        <jenkins.version>${jenkins.baseline}.1</jenkins.version>
         <gitHubRepo>jenkinsci/${project.artifactId}-plugin</gitHubRepo>
         <concurrency>2</concurrency>
         <!-- disable SpotBugs temporarily since there are 62 bugs -->
@@ -80,7 +82,7 @@
         <dependencies>
             <dependency>
                 <groupId>io.jenkins.tools.bom</groupId>
-                <artifactId>bom-2.479.x</artifactId>
+                <artifactId>bom-${jenkins.baseline}.x</artifactId>
                 <version>3761.vd922730f0fd2</version>
                 <type>pom</type>
                 <scope>import</scope>