Bump lombok from 1.18.26 to 1.18.28 in /plugins/maven/example-client (#1224)

Bumps [lombok](https://github.com/projectlombok/lombok) from 1.18.26 to 1.18.28.
- [Release notes](https://github.com/projectlombok/lombok/releases)
- [Changelog](https://github.com/projectlombok/lombok/blob/master/doc/changelog.markdown)
- [Commits](https://github.com/projectlombok/lombok/compare/v1.18.26...v1.18.28)

---
updated-dependencies:
- dependency-name: org.projectlombok:lombok
  dependency-type: direct:production
  update-type: version-update:semver-patch
...
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Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

plugins/maven/example-client/pom.xml

@@ -174,7 +174,7 @@
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
-            <version>1.18.26</version>
+            <version>1.18.28</version>
         </dependency>
 
         <dependency>