Bump ASM version to be Java 8+ compatible

Closes gh-10647

Author: snicoll

spring-boot-project/spring-boot-tools/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/MainClassFinder.java

@@ -41,6 +41,7 @@
 import org.springframework.asm.ClassVisitor;
 import org.springframework.asm.MethodVisitor;
 import org.springframework.asm.Opcodes;
+import org.springframework.asm.SpringAsmInfo;
 import org.springframework.asm.Type;
 
 /**
@@ -298,7 +299,7 @@ private static class ClassDescriptor extends ClassVisitor {
 		private boolean mainMethodFound;
 
 		ClassDescriptor() {
-			super(Opcodes.ASM4);
+			super(SpringAsmInfo.ASM_VERSION);
 		}
 
 		@Override