Add pluginManagement & upgrade Develocity plugins

Author: artembilan

settings.gradle

@@ -1,6 +1,14 @@
+pluginManagement {
+	repositories {
+		mavenCentral()
+		gradlePluginPortal()
+		maven { url 'https://repo.spring.io/release' }
+	}
+}
+
 plugins {
-	id 'com.gradle.enterprise' version '3.12.3'
-	id 'io.spring.ge.conventions' version '0.0.14'
+	id 'com.gradle.enterprise' version '3.15.1'
+	id 'io.spring.ge.conventions' version '0.0.15'
 }
 
 rootProject.name = 'spring-kafka-dist'