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/build.gradle.kts

@@ -11,6 +11,7 @@ dependencies {
     api(project(":core:util.runtime"))
     api(project(":core:descriptors"))
     api(commonDependency("javax.inject"))
+    kotlinCompilerClasspath(project(":libraries:tools:stdlib-compiler-classpath"))
 }
 
 sourceSets {