Remove BDDMockito Checkstyle rule

This commit removes the BDDMockito Checkstyle rule, since it did not
actually enforce the use of BDDMockito.

This commit also updates static imports to use Mockito instead of
BDDMockito where appropriate (automated via the Eclipse IDE Organize
Imports clean-up task).

Closes gh-34616

spring-aop/src/test/java/org/springframework/aop/interceptor/AsyncExecutionInterceptorTests.java

@@ -27,13 +27,12 @@ import org.mockito.ArgumentCaptor;
 import org.springframework.core.task.AsyncTaskExecutor;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.BDDMockito.given;
-import static org.mockito.Mockito.any;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 
-
 /**
  * Tests for {@link AsyncExecutionInterceptor}.
  *