Prohibit JVM target 1.6

But still compile stdlib, reflect, kotlin.test and scripting runtimes
with JVM target 1.6 to simplify migration from Kotlin 1.6 to 1.7.

 #KT-45165 Fixed

core/deserialization.common/build.gradle.kts

@@ -8,6 +8,7 @@ project.configureJvmToolchain(JdkMajorVersion.JDK_1_6)
 dependencies {
     api(project(":core:compiler.common"))
     api(project(":core:metadata"))
+    kotlinCompilerClasspath(project(":libraries:tools:stdlib-compiler-classpath"))
 }
 
 sourceSets {