Bump org.projectlombok:lombok in /plugins/gradle/example-client (#1229)

Bumps [org.projectlombok: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
...
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

plugins/gradle/example-client/build.gradle

@@ -30,8 +30,8 @@ dependencies {
     implementation "org.mapstruct:mapstruct:1.5.5.Final"
     annotationProcessor "org.mapstruct:mapstruct-processor:1.5.5.Final"
 
-    compileOnly "org.projectlombok:lombok:1.18.26"
-    annotationProcessor "org.projectlombok:lombok:1.18.26"
+    compileOnly "org.projectlombok:lombok:1.18.28"
+    annotationProcessor "org.projectlombok:lombok:1.18.28"
 
     testImplementation "io.rest-assured:rest-assured:5.3.1"
     testImplementation "org.junit.jupiter:junit-jupiter-api:5.9.3"