Drop K/N dependency to JCenter

kotlin-native/tools/performance-server/ui/buildSrc/build.gradle.kts

@@ -22,7 +22,6 @@ buildscript {
 
     repositories {
         maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/kotlin-dependencies")
-        jcenter()
         project.bootstrapKotlinRepo?.let {
             maven(url = it)
         }
@@ -46,7 +45,6 @@ plugins {
 val cacheRedirectorEnabled = findProperty("cacheRedirectorEnabled")?.toString()?.toBoolean() == true
 repositories {
     maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/kotlin-dependencies")
-    jcenter()
     gradlePluginPortal()
     extra["bootstrapKotlinRepo"]?.let {
         maven(url = it)

kotlin-native/tools/performance-server/ui/buildSrc/settings.gradle.kts

@@ -6,7 +6,6 @@ pluginManagement {
                 artifact()
             }
         }
-        jcenter()
         mavenCentral()
         gradlePluginPortal()
     }