Use libs-snapshot which can also resolve milestones and RCs

This ensures that RCs and Milestones are also able to be loaded
using a single repository.

Author: rwinch

pom.xml

@@ -183,7 +183,7 @@
         <pluginRepository>
             <id>spring-snapshots</id>
             <name>Spring Snapshots</name>
-            <url>https://repo.spring.io/snapshot</url>
+            <url>https://repo.spring.io/libs-snapshot</url>
             <snapshots>
                 <enabled>true</enabled>
             </snapshots>
@@ -193,7 +193,7 @@
         <repository>
             <id>spring-snapshots</id>
             <name>Spring Snapshots</name>
-            <url>http://repo.spring.io/snapshot</url>
+            <url>http://repo.spring.io/libs-snapshot</url>
         </repository>
     </repositories>
 </project>