Fix jitpack build

build.gradle

@@ -32,19 +32,13 @@ dependencies {
     annotationProcessor 'org.jetbrains:annotations:23.0.0'
 }
 
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
+
 compileJava {
     options.encoding = 'UTF-8'
 }
 
-java {
-    def javaVersion = JavaVersion.VERSION_1_8
-    sourceCompatibility = javaVersion
-    targetCompatibility = javaVersion
-    if (JavaVersion.current() < javaVersion) {
-        toolchain.languageVersion = JavaLanguageVersion.of(targetJavaVersion)
-    }
-}
-
 publishing {
     publications {
         shadow(MavenPublication) {