fix pmd warnings, codemetrics-2.0.0, gradle-8.4

gradle-8.4 released, fully supports java-21. codemetrics-2.0.0
has the pmd rules inlined, so warnings are gone now. see
MovingBlocks/TeraConfig#19 .

build.gradle

@@ -104,7 +104,7 @@ dependencies {
 
 
     // Config for our code analytics lives in a centralized repo: https://github.com/MovingBlocks/TeraConfig
-    codeMetrics group: 'org.terasology.config', name: 'codemetrics', version: '1.6.3', ext: 'zip'
+    codeMetrics group: 'org.terasology.config', name: 'codemetrics', version: '2.0.0', ext: 'zip'
 
     // Natives for JNLua (Kallisti, KComputers)
     natives group: 'org.terasology.jnlua', name: 'jnlua_natives', version: '0.1.0-SNAPSHOT', ext: 'zip'

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-all.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME