remove the bom (#252)

it is just meaningless noise, the project does not depend on any other plugins, and commits updating it are just work for works sake

Author: jtnord

pom.xml

@@ -48,18 +48,6 @@
     <spotless.check.skip>false</spotless.check.skip>
   </properties>
 
-  <dependencyManagement>
-    <dependencies>
-      <dependency>
-        <!-- 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>4845.v9163d3278e4f</version>
-        <type>pom</type>
-        <scope>import</scope>
-      </dependency>
-    </dependencies>
-  </dependencyManagement>
   <dependencies>
     <dependency>
       <groupId>org.apache.httpcomponents</groupId>