removed version from pom.xml from common/util for spring-core (version already d…

…efined through the root dependency management)

@@ -39,7 +39,6 @@
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-core</artifactId>
-            <version>${spring.version}</version>
         </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>