Revert Spring Cloud Commons upgrade until a fix for docs is available

spring-cloud-stream-codec/pom.xml

@@ -18,6 +18,10 @@
 			<groupId>com.esotericsoftware</groupId>
 			<artifactId>kryo-shaded</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-core</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.integration</groupId>
 			<artifactId>spring-integration-core</artifactId>