Remove AspectJ dependency.

The dependency was seemingly introduced as a workaround to a Maven problem before this project even had the name Spring Data JPA.

No problems are noticeable when building without the dependency or when using it in a simple Spring Boot app without it.

Closes #2218

Author: schauder

pom.xml

@@ -165,11 +165,6 @@
 			</exclusions>
 		</dependency>
 
-		<dependency>
-			<groupId>org.aspectj</groupId>
-			<artifactId>aspectjrt</artifactId>
-			<version>${aspectj}</version>
-		</dependency>
 		<dependency>
 			<groupId>org.aspectj</groupId>
 			<artifactId>aspectjweaver</artifactId>