Upgrade dependency on Jackson following dependabot

Change-Id: Ie84a4492fa8ff7d76cdd4cc19634136483be5926
diff --git a/pom.xml b/pom.xml
index fa60e61..2459334 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
     <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-databind</artifactId>
-      <version>2.9.8</version>
+      <version>2.12.5</version>
     </dependency>
 
     <!-- jetty -->