Update plugin io.freefair.lombok to v8.6 (#245) (#249)

(cherry picked from commit 9186ecc)

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build.gradle

@@ -44,7 +44,7 @@ buildscript {
 plugins {
     id 'java-library'
     id 'com.diffplug.spotless' version '6.23.0'
-    id "io.freefair.lombok" version "8.4"
+    id "io.freefair.lombok" version "8.6"
     id "de.undercouch.download" version "5.3.0"
 }