Remove dependency management for spring-erlang

spring-erlang is no longer part of Spring AMQP so the dependency
management for it is no longer required.

Closes gh-2946

spring-boot-dependencies/pom.xml

@@ -1400,11 +1400,6 @@
 				<artifactId>spring-amqp</artifactId>
 				<version>${spring-amqp.version}</version>
 			</dependency>
-			<dependency>
-				<groupId>org.springframework.amqp</groupId>
-				<artifactId>spring-erlang</artifactId>
-				<version>${spring-amqp.version}</version>
-			</dependency>
 			<dependency>
 				<groupId>org.springframework.amqp</groupId>
 				<artifactId>spring-rabbit</artifactId>