Provide dependency management for all of Spring REST Docs

Add dependency management for spring-restdocs-core

spring-boot-dependencies/pom.xml

@@ -1751,6 +1751,11 @@
 				<artifactId>spring-plugin-core</artifactId>
 				<version>${spring-plugin.version}</version>
 			</dependency>
+			<dependency>
+				<groupId>org.springframework.restdocs</groupId>
+				<artifactId>spring-restdocs-core</artifactId>
+				<version>${spring-restdocs.version}</version>
+			</dependency>
 			<dependency>
 				<groupId>org.springframework.restdocs</groupId>
 				<artifactId>spring-restdocs-mockmvc</artifactId>