[K/N][build] Fix build version property usage

kotlin-native/tools/benchmarksAnalyzer/buildSrc/settings.gradle.kts

@@ -1,7 +1,6 @@
 pluginManagement {
     repositories {
         maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/kotlin-dependencies")
-        jcenter()
         mavenCentral()
         gradlePluginPortal()
     }
@@ -12,7 +11,8 @@ buildscript {
         maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/kotlin-dependencies")
         mavenCentral()
     }
+    val buildGradlePluginVersion = extra["kotlin.build.gradlePlugin.version"]
     dependencies {
-        classpath("org.jetbrains.kotlin:kotlin-build-gradle-plugin:${extra["kotlin.build.gradlePlugin.version"]}")
+        classpath("org.jetbrains.kotlin:kotlin-build-gradle-plugin:$buildGradlePluginVersion")
     }
 }