Merge pull request #1884 from jenkinsci/jna-update-4.2.1

Update JNA to 4.2.1

core/pom.xml

@@ -514,7 +514,7 @@ THE SOFTWARE.
     <dependency>
       <groupId>net.java.dev.jna</groupId>
       <artifactId>jna</artifactId>
-      <version>4.2.0</version>
+      <version>4.2.1</version>
     </dependency>
     <dependency>
       <groupId>org.kohsuke</groupId>