Migrate repo to use JVM toolchains Gradle feature.

^KT-46972 Fixed

dependencies/tools-jar-api/build.gradle.kts

@@ -5,6 +5,7 @@ import java.util.zip.ZipFile
 
 plugins {
     base
+    `java-base`
 }
 
 val runtimeElements by configurations.creating {
@@ -15,10 +16,8 @@ val runtimeElements by configurations.creating {
     }
 }
 
-val JDK_18: String by rootProject.extra
-
 val toolsJarStubs by tasks.registering {
-    val toolsJarFile = toolsJarFile(jdkHome = File(JDK_18)) ?: error("Couldn't find tools.jar in $JDK_18")
+    val toolsJarFile = toolsJar().singleFile
     inputs.file(toolsJarFile)
 
     val outDir = buildDir.resolve(name)