Release preparation for version 2.16.3

java/ql/lib/change-notes/released/0.8.9.md

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+## 0.8.9
+
+### Deprecated APIs
+
+* The `PathCreation` class in `PathCreation.qll` has been deprecated.
+
+### Minor Analysis Improvements
+
+* An extension point for sanitizers of the query `java/unvalidated-url-redirection` has been added.
+* Added models for the following packages:
+
+  * java.io
+  * java.lang
+  * java.net
+  * java.net.http
+  * java.nio.file
+  * java.util.zip
+  * javax.servlet
+  * org.apache.commons.io
+  * org.apache.hadoop.fs
+  * org.apache.hadoop.fs.s3a
+  * org.eclipse.jetty.client
+  * org.gradle.api.file