Java: Add change note.

Author: aschackmull

change-notes/1.23/analysis-java.md

@@ -6,6 +6,7 @@ The following changes in version 1.23 affect Java analysis in all applications.
 
 | **Query**                    | **Expected impact**    | **Change**                        |
 |------------------------------|------------------------|-----------------------------------|
+| Dereferenced variable may be null (`java/dereferenced-value-may-be-null`) | Fewer false positives | Certain indirect null guards involving two auxiliary variables known to be equal can now be detected. |
 | Query built from user-controlled sources (`java/sql-injection`) | More results | The query now identifies arguments to `Statement.executeLargeUpdate` and `Connection.prepareCall` as SQL expressions sinks. |
 | Query built from local-user-controlled sources (`java/sql-injection-local`) | More results | The query now identifies arguments to `Statement.executeLargeUpdate` and `Connection.prepareCall` as SQL expressions sinks. |
 | Query built without neutralizing special characters (`java/concatenated-sql-query`) | More results | The query now identifies arguments to `Statement.executeLargeUpdate` and `Connection.prepareCall` as SQL expressions sinks. |