Update dependency org.jenkins-ci.plugins:jira to v3.21 (jenkinsci#2758)

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

Author: renovate[bot]

integrations/pom.xml

@@ -209,7 +209,7 @@
     <dependency>
       <groupId>org.jenkins-ci.plugins</groupId>
       <artifactId>jira</artifactId>
-      <version>3.20</version>
+      <version>3.21</version>
       <scope>test</scope>
     </dependency>
     <dependency>