Revert "add cleanup dependencies tasks for buildSrc"

This reverts commit 8a8536f8

gradle.properties

@@ -1,17 +1,13 @@
 org.gradle.jvmargs=-Duser.country=US -Dkotlin.daemon.jvm.options=-Xmx1600m -Dfile.encoding=UTF-8
 
 cacheRedirectorEnabled=true
-defaultSnapshotVersion=1.4-SNAPSHOT
 
 kotlin.compiler.effectSystemEnabled=true
 kotlin.compiler.newInferenceEnabled=true
 #maven.repository.mirror=http://repository.jetbrains.com/remote-repos/
-#bootstrap.custom.kotlin.repo=https://dl.bintray.com/kotlin/kotlin-dev
-#bootstrap.custom.kotlin.version=1.1.50-dev-1451
-bootstrap.kotlin.version=1.4.0-dev-1148
-
+#bootstrap.kotlin.repo=https://dl.bintray.com/kotlin/kotlin-dev
+#bootstrap.kotlin.version=1.1.50-dev-1451
 #signingRequired=true
-#org.gradle.debug=true
 
 ## The following properties can be added to your local.properties file to customize the build: