Make jackson-module-parameter-names optional

Update the spring-boot-autoconfigure POM so that
jackson-module-parameter-names is optional.

See gh-3804

spring-boot-autoconfigure/pom.xml

@@ -58,6 +58,7 @@
 		<dependency>
 			<groupId>com.fasterxml.jackson.module</groupId>
 			<artifactId>jackson-module-parameter-names</artifactId>
+			<optional>true</optional>
 		</dependency>
 		<dependency>
 			<groupId>com.google.code.gson</groupId>