Bump io.freefair.lombok from 6.2.0 to 8.6 in /gpc-api-facade (#467)

Bumps [io.freefair.lombok](https://github.com/freefair/gradle-plugins) from 6.2.0 to 8.6.
- [Release notes](https://github.com/freefair/gradle-plugins/releases)
- [Commits](freefair/gradle-plugins@6.2.0...8.6)

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

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

gpc-api-facade/build.gradle

@@ -4,7 +4,7 @@ plugins {
     id 'java'
     id 'checkstyle'
     id 'com.github.spotbugs' version '6.0.6'
-    id 'io.freefair.lombok' version '6.2.0'
+    id 'io.freefair.lombok' version '8.6'
 }
 
 apply plugin: 'java'