Bump io.freefair.lombok from 8.3 to 8.7.1 in /docs/examples/lombok

Bumps [io.freefair.lombok](https://github.com/freefair/gradle-plugins) from 8.3 to 8.7.1.
- [Release notes](https://github.com/freefair/gradle-plugins/releases)
- [Commits](freefair/gradle-plugins@8.3...8.7.1)

---
updated-dependencies:
- dependency-name: io.freefair.lombok
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

docs/examples/lombok/build.gradle

@@ -4,7 +4,7 @@
 
 plugins {
     id 'java'
-    id 'io.freefair.lombok' version '8.3'
+    id 'io.freefair.lombok' version '8.7.1'
     // Checker Framework pluggable type-checking
     id 'org.checkerframework' version '0.6.40'
 }