Update Log4j2 config and shadowJar transformer usage

Removed the custom 'packages' attribute from log4j2.xml configuration and updated the shadowJar task to use the class reference for Log4j2PluginsCacheFileTransformer. This streamlines configuration and aligns with recommended usage.

build.gradle.kts

@@ -1,5 +1,3 @@
-import com.github.jengelman.gradle.plugins.shadow.transformers.Log4j2PluginsCacheFileTransformer
-
 plugins {
     application
     idea
@@ -61,7 +59,7 @@ repositories {
 }
 
 tasks.shadowJar {
-    transform(Log4j2PluginsCacheFileTransformer())
+    transform(com.github.jengelman.gradle.plugins.shadow.transformers.Log4j2PluginsCacheFileTransformer::class.java)
 }
 
 tasks.test {

src/main/resources/log4j2.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<Configuration packages="pl.tkowalcz.tjahzi.log4j2" status="WARN">
+<Configuration status="WARN">
   <Properties>
     <Property name="CONSOLE_LOG_PATTERN">%d{HH:mm:ss.SSS} %5p --- [%t] %c : %m%n</Property>
     <Property name="CONSOLE_LOG_CHARSET">UTF-8</Property>