Update lombok plugin

[ST-DDT]

> Configure project :
[versioning] WARNING - the working copy has unstaged or uncommitted changes.
The JavaExec.main property has been deprecated. This is scheduled to be removed in Gradle 8.0. Please use the mainClass property instead. See https://docs.gradle.org/7.3/dsl/org.gradle.api.tasks.JavaExec.html#org.gradle.api.tasks.JavaExec:main for more details.
	at org.gradle.api.tasks.JavaExec.setMain(JavaExec.java:420)
	at io.franzbecker.gradle.lombok.task.DelombokTask_Decorated.setMain(Unknown Source)
	at org.gradle.api.tasks.JavaExec$setMain.callCurrent(Unknown Source)
	at io.franzbecker.gradle.lombok.task.DelombokTask.configure(DelombokTask.groovy:26)
	at org.gradle.api.internal.project.DefaultProject.task(DefaultProject.java:1289)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:323)
	at org.gradle.internal.extensibility.MixInClosurePropertiesAsMethodsDynamicObject.tryInvokeMethod(MixInClosurePropertiesAsMethodsDynamicObject.java:34)
	at build_19sz3e6vvj1kq1n45u9yqog22$_run_closure5.doCall(/home/runner/work/grpc-spring-boot-starter/grpc-spring-boot-starter/build.gradle:223)
	at java.lang.reflect.Method.invoke(Method.java:498)
	[...]