Remove developers section from pom file (#373)

The repository permissions updater is the definitive list of plugin
developers.  The plugin archetype has not suggested a `<developers>`
section since the 2022 merge of:

* jenkinsci/archetypes#515

Rather than carry duplicated information in the pom.xml file, remove the
`<developers>` section to better match the plugin archetype and further
reduce the maintenance burden.

pom.xml

@@ -22,25 +22,6 @@
     </license>
   </licenses>
 
-  <developers>
-    <developer>
-      <id>markewaite</id>
-      <name>Mark Waite</name>
-      <email>[email protected]</email>
-      <roles>
-        <role>developer</role>
-      </roles>
-    </developer>
-    <developer>
-      <id>imod</id>
-      <name>Dominik Bartholdi</name>
-      <email />
-      <roles>
-        <role>emeritus</role>
-      </roles>
-    </developer>
-  </developers>
-
   <scm>
     <connection>scm:git:https://github.com/${gitHubRepo}</connection>
     <developerConnection>scm:git:[email protected]:${gitHubRepo}.git</developerConnection>