update gradle, forgegradle and add plugin for code remapping

build.gradle

@@ -4,19 +4,20 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath group: 'net.minecraftforge.gradle', name: 'ForgeGradle', version: '4.1.+', changing: true
+        classpath group: 'net.minecraftforge.gradle', name: 'ForgeGradle', version: '5.1.+', changing: true
     }
 }
 apply plugin: 'net.minecraftforge.gradle'
 // Only edit below this line, the above code adds and enables the necessary things for Forge to be setup.
 apply plugin: 'eclipse'
 apply plugin: 'maven-publish'
+apply from: 'https://raw.githubusercontent.com/SizableShrimp/Forge-Class-Remapper/main/classremapper.gradle'
 
 version = '1.0.3'
 group = 'de.skate702.craftingkeys' // http://maven.apache.org/guides/mini/guide-naming-conventions.html
 archivesBaseName = 'craftingkeys'
 
-sourceCompatibility = targetCompatibility = compileJava.sourceCompatibility = compileJava.targetCompatibility = '1.8' // Need this here so eclipse task generates correctly.
+sourceCompatibility = targetCompatibility = compileJava.sourceCompatibility = compileJava.targetCompatibility = JavaLanguageVersion.of(8) // Need this here so eclipse task generates correctly.
 compileJava.options.encoding = "UTF-8"
 
 println('Java: ' + System.getProperty('java.version') + ' JVM: ' + System.getProperty('java.vm.version') + '(' + System.getProperty('java.vendor') + ') Arch: ' + System.getProperty('os.arch'))

gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3-bin.zip