Relax -aspects dependence on -test (compile=>test)

The spring-aspects Maven pom had an incorrect compile-scoped dependence
on spring-test. In fact, spring-aspects only uses spring-test in its
unit tests. The pom has been updated accordingly, meaning that use
of spring-aspects in Maven-based applications will no longer require
spring-test on the classpath at runtime.

ivy.xml metadata did not need updating, as it was already correct.

This change is only necessary on the 3.1.x line; in 3.2.x (master) Maven
poms are generated automatically from Gradle dependency metadata, which
is also already correct.

Issue: SPR-9048

org.springframework.aspects/pom.xml

@@ -61,7 +61,7 @@
       <groupId>org.springframework</groupId>
       <artifactId>spring-test</artifactId>
       <version>${project.version}</version>
-      <scope>compile</scope>
+      <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>javax.persistence</groupId>