Merge pull request #409 from jenkinsci/dependabot/maven/org.jenkins-ci.plugins-timestamper-1.18

Bump timestamper from 1.17 to 1.18

Author: uhafner

plugin/pom.xml

@@ -241,7 +241,7 @@
     <dependency>
       <groupId>org.jenkins-ci.plugins</groupId>
       <artifactId>timestamper</artifactId>
-      <version>1.17</version>
+      <version>1.18</version>
       <scope>test</scope>
     </dependency>