Bump org.projectlombok:lombok in /data-prepper-plugins/opensearch (#6107)

Bumps [org.projectlombok:lombok](https://github.com/projectlombok/lombok) from 1.18.38 to 1.18.42.
- [Changelog](https://github.com/projectlombok/lombok/blob/master/doc/changelog.markdown)
- [Commits](projectlombok/lombok@v1.18.38...v1.18.42)

---
updated-dependencies:
- dependency-name: org.projectlombok:lombok
  dependency-version: 1.18.42
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

data-prepper-plugins/opensearch/build.gradle

@@ -4,8 +4,8 @@
  */
 
 dependencies {
-    compileOnly 'org.projectlombok:lombok:1.18.38'
-    annotationProcessor 'org.projectlombok:lombok:1.18.38'
+    compileOnly 'org.projectlombok:lombok:1.18.42'
+    annotationProcessor 'org.projectlombok:lombok:1.18.42'
     implementation project(':data-prepper-api')
     implementation libs.armeria.core
     testImplementation project(':data-prepper-api').sourceSets.test.output