added spring-core for the root dependency management

pom.xml

@@ -1009,6 +1009,11 @@
                     </exclusion>
                 </exclusions>
             </dependency>
+            <dependency>
+                <groupId>org.springframework</groupId>
+                <artifactId>spring-core</artifactId>
+                <version>${spring.version}</version>
+            </dependency>
             <dependency>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-starter-web</artifactId>