Update dependency org.jenkins-ci.plugins:plugin to v6 (#114)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>org.jenkins-ci.plugins</groupId>
         <artifactId>plugin</artifactId>
-        <version>5.2102.v5f5fe09fccf1</version>
+        <version>6.2108.v08c2b_01b_cf4d</version>
         <relativePath />
     </parent>