Removed the zipkin starter from BOM

Author: marcingrzejszczak

spring-cloud-sleuth-dependencies/pom.xml

@@ -58,11 +58,6 @@
 				<artifactId>spring-cloud-sleuth-zipkin</artifactId>
 				<version>${project.version}</version>
 			</dependency>
-			<dependency>
-				<groupId>org.springframework.cloud</groupId>
-				<artifactId>spring-cloud-starter-zipkin</artifactId>
-				<version>${project.version}</version>
-			</dependency>
 			<dependency>
 				<groupId>org.springframework.cloud</groupId>
 				<artifactId>spring-cloud-starter-sleuth</artifactId>