Remove Spring milestones repository

Author: erdemedeiros

activiti-cloud-build/pom.xml

@@ -205,11 +205,6 @@
     <module>activiti-cloud-build-dependencies-parent</module>
   </modules>
   <repositories>
-    <repository>
-      <id>spring-milestones</id>
-      <name>Spring Milestones</name>
-      <url>https://repo.spring.io/milestone</url>
-    </repository>
     <repository>
       <id>central</id>
       <name>Central Repository</name>