Revert "Advance bootstrap to 1.9.0-dev-6379"

This reverts commit fe44727f97.

Revert is needed because of KT-58160

.idea/kotlinc.xml

@@ -9,6 +9,6 @@
     <option name="additionalArguments" value="-version -Xallow-kotlin-package -Xskip-metadata-version-check" />
   </component>
   <component name="KotlinJpsPluginSettings">
-    <option name="version" value="1.9.0-dev-6379" />
+    <option name="version" value="1.9.0-dev-4392" />
   </component>
 </project>

gradle.properties

@@ -35,7 +35,7 @@ kotlin.build.gradlePlugin.version=0.0.39
 #maven.repository.mirror=http://repository.jetbrains.com/remote-repos/
 #bootstrap.kotlin.repo=https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap
 #bootstrap.kotlin.version=1.1.50-dev-1451
-bootstrap.kotlin.default.version=1.9.0-dev-6379
+bootstrap.kotlin.default.version=1.9.0-dev-4392
 
 kotlin.build.publishing.attempts=20
 #signingRequired=true