Move @Mock annotations

Update a couple of tests to use the more traditional `@Mock` annotation
placement.

Issue gh-8945

aspects/src/test/java/org/springframework/security/access/intercept/aspectj/aspect/AnnotationSecurityAspectTests.java

@@ -59,7 +59,8 @@ public class AnnotationSecurityAspectTests {
 
 	private AffirmativeBased adm;
 
-	private @Mock AuthenticationManager authman;
+	@Mock
+	private AuthenticationManager authman;
 
 	private TestingAuthenticationToken anne = new TestingAuthenticationToken("anne", "", "ROLE_A");