sun/security/util/DerValue/Indefinite.java fails with ---illegal-access=deny

This test needs to be updated to work with --illegal-access=deny as this will be the default in the future. Without a fix, the test will fail with:

java.lang.reflect.InaccessibleObjectException: Unable to make field final byte[] sun.security.util.DerValue.buffer accessible: module java.base does not "opens sun.security.util" to unnamed module @77a57272
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:177)
at java.base/java.lang.reflect.Field.setAccessible(Field.java:171)
at Indefinite.test(Indefinite.java:72)
at Indefinite.main(Indefinite.java:46)


diff --git a/test/jdk/sun/security/util/DerValue/Indefinite.java b/test/jdk/sun/security/util/DerValue/Indefinite.java
index 17270c6642f..f69a0515041 100644
--- a/test/jdk/sun/security/util/DerValue/Indefinite.java
+++ b/test/jdk/sun/security/util/DerValue/Indefinite.java
@@ -25,7 +25,7 @@
  * @test
  * @bug 6731685 8249783
  * @summary CertificateFactory.generateCertificates throws IOException on PKCS7 cert chain
- * @modules java.base/sun.security.util
+ * @modules java.base/sun.security.util:+open
  * @library /test/lib
  */