Upgrade to AspectJ 1.9 beta 2 (for build compatibility with JDK 9 build 74+)

Issue: SPR-13297

Author: jhoeller

build.gradle

@@ -1067,7 +1067,7 @@ project("spring-aspects") {
 
 	dependencies {
 		aspects(project(":spring-orm"))
-		ajc("org.aspectj:aspectjtools:1.9.0.BETA-1")  // for the ability to build on JDK 9, not exposed in the POMs yet
+		ajc("org.aspectj:aspectjtools:1.9.0.BETA-2")  // for the ability to build on JDK 9, not exposed in the POMs yet
 		rt("org.aspectj:aspectjrt:${aspectjVersion}")  // regular AspectJ version here, to be exposed in the POMs
 		compile("org.aspectj:aspectjweaver:${aspectjVersion}")
 		provided("org.eclipse.persistence:javax.persistence:2.0.0")