HADOOP-16365. Upgrade jackson-databind to 2.9.9. Contributed by Shweta Yakkali.

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>

hadoop-project/pom.xml

@@ -69,7 +69,7 @@
 
     <!-- jackson versions -->
     <jackson.version>1.9.13</jackson.version>
-    <jackson2.version>2.9.8</jackson2.version>
+    <jackson2.version>2.9.9</jackson2.version>
 
     <!-- httpcomponents versions -->
     <httpclient.version>4.5.6</httpclient.version>