Bump io.freefair.lombok from 8.3 to 8.6

Bumps [io.freefair.lombok](https://github.com/freefair/gradle-plugins) from 8.3 to 8.6.
- [Release notes](https://github.com/freefair/gradle-plugins/releases)
- [Commits](freefair/gradle-plugins@8.3...8.6)

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

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

build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
     `java-library`
     signing
     `maven-publish`
-    id("io.freefair.lombok") version "8.3"
+    id("io.freefair.lombok") version "8.6"
     id("io.github.gradle-nexus.publish-plugin") version "1.3.0"
     id("net.researchgate.release") version "3.0.2"
     checkstyle