Fix gradle dependency

mirai-core-qqandroid/build.gradle.kts

@@ -119,4 +119,8 @@ kotlin {
     }
 }
 
+tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
+    kotlinOptions.jvmTarget = "1.8"
+}
+
 apply(from = rootProject.file("gradle/publish.gradle"))

mirai-core/build.gradle.kts

@@ -151,4 +151,8 @@ kotlin {
     }
 }
 
+tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
+    kotlinOptions.jvmTarget = "1.8"
+}
+
 apply(from = rootProject.file("gradle/publish.gradle"))

mirai-demos/mirai-demo-1/build.gradle

@@ -2,9 +2,9 @@ apply plugin: "kotlin"
 apply plugin: "java"
 
 dependencies {
-    implementation files("../../mirai-core/build/classes/kotlin/jvm/main") // IDE bug
+    runtimeOnly files("../../mirai-core/build/classes/kotlin/jvm/main") // IDE bug
 
-    implementation files("../../mirai-core-qqandroid/build/classes/kotlin/jvm/main") // IDE bug
+    runtimeOnly files("../../mirai-core-qqandroid/build/classes/kotlin/jvm/main") // IDE bug
     implementation project(":mirai-core-qqandroid")
 
     api group: 'org.jetbrains.kotlin', name: 'kotlin-stdlib-jdk8', version: kotlinVersion

mirai-demos/mirai-demo-java/build.gradle

@@ -2,9 +2,9 @@ apply plugin: "java"
 apply plugin: "kotlin"
 
 dependencies {
-    implementation files("../../mirai-core/build/classes/kotlin/jvm/main") // IDE bug
+    runtimeOnly files("../../mirai-core/build/classes/kotlin/jvm/main") // IDE bug
 
-    implementation files("../../mirai-core-qqandroid/build/classes/kotlin/jvm/main") // IDE bug
+    runtimeOnly files("../../mirai-core-qqandroid/build/classes/kotlin/jvm/main") // IDE bug
     implementation project(":mirai-core-qqandroid")
     implementation project(":mirai-japt")
 }

mirai-japt/build.gradle.kts

@@ -18,9 +18,9 @@ buildscript {
 plugins {
     kotlin("jvm")
     java
+    id("com.jfrog.bintray") version "1.8.0"
     `maven-publish`
     // maven
-    id("com.jfrog.bintray") version "1.8.0"
 }
 
 val kotlinVersion: String by rootProject.ext
@@ -77,6 +77,10 @@ tasks.withType<JavaCompile>() {
     options.encoding = "UTF-8"
 }
 
+tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
+    kotlinOptions.jvmTarget = "1.8"
+}
+
 bintray {
     val keyProps = Properties()
     val keyFile = file("../keys.properties")