Use JDK9 in keep attributes dots test to fix windows invocation

Windows do not have JDK 8.

Change-Id: If5b18e80caae0694a19314e307dce194f3be9929
diff --git a/src/test/java/com/android/tools/r8/shaking/attributes/KeepAttributesDotsTest.java b/src/test/java/com/android/tools/r8/shaking/attributes/KeepAttributesDotsTest.java
index 97763b1..58671ab 100644
--- a/src/test/java/com/android/tools/r8/shaking/attributes/KeepAttributesDotsTest.java
+++ b/src/test/java/com/android/tools/r8/shaking/attributes/KeepAttributesDotsTest.java
@@ -51,7 +51,7 @@
         .addKeepAllClassesRule()
         .addKeepAttributes(keepAttributes)
         .addKeepRules("-dontwarn com.android.tools.r8.shaking.attributes.*")
-        .run(TestRuntime.getCheckedInJdk8(), Main.class)
+        .run(TestRuntime.getCheckedInJdk9(), Main.class)
         .assertSuccessWithOutputLines("Hello World!")
         .inspect(this::inspect);
   }
@@ -62,7 +62,7 @@
         .addProgramClassesAndInnerClasses(Main.class)
         .addKeepAttributes(keepAttributes)
         .addKeepAllClassesRule()
-        .run(TestRuntime.getCheckedInJdk8(), Main.class)
+        .run(TestRuntime.getCheckedInJdk9(), Main.class)
         .assertSuccessWithOutputLines("Hello World!")
         .inspect(this::inspect);
   }