Bug#894397: lintian: Update unknown-java-class-version for Java 9

[Bas Couwenberg <sebastic@xs4all.nl>]

Source: lintian
Version: 2.5.80
Followup-For: Bug #894397

Dear Maintainer,

The attached patch also updates the unknown-java-class-version
description for Java 9.

Kind Regards,

Bas

diff --git a/checks/java.desc b/checks/java.desc
index 27739e139..329714646 100644
--- a/checks/java.desc
+++ b/checks/java.desc
@@ -91,7 +91,7 @@ Info: The package contains a Jar file with Java class files compiled for an
  for a newer version of Java than Lintian knows about.  In the latter case,
  please file a bug against Lintian.
  .
- The latest class version known by Lintian is Java8 (Major version 52).
+ The latest class version known by Lintian is Java9 (Major version 53).
 
 Tag: zip-parse-error
 Severity: normal