Bump mapstruct in /plugins/maven/example-server (#516)

Bumps [mapstruct](https://github.com/mapstruct/mapstruct) from 1.4.1.Final to 1.4.2.Final.
- [Release notes](https://github.com/mapstruct/mapstruct/releases)
- [Commits](https://github.com/mapstruct/mapstruct/compare/1.4.1.Final...1.4.2.Final)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

plugins/maven/example-server/pom.xml

@@ -107,7 +107,7 @@
         <dependency>
             <groupId>org.mapstruct</groupId>
             <artifactId>mapstruct</artifactId>
-            <version>1.4.1.Final</version>
+            <version>1.4.2.Final</version>
         </dependency>
         <dependency>
             <groupId>org.projectlombok</groupId>