Update Jackson to 2.9.9

Problem
In order to make util cross building with scala 2.13, we need to move to Jackson
2.9.9 for 2.13 support.

Solution
Upgrade it.

Result
As a bonus, Jackson fixes a bug
FasterXML/jackson-core#531 when feeding async json
parser, remove the `slicedOffset` as now parser records the right position.

Differential Revision: https://phabricator.twitter.biz/D345969

CHANGELOG.rst

@@ -20,6 +20,11 @@ Breaking API Changes
   to use `com.twitter.logging.LoggerFactory` where necessary. Users are encouraged to use
   'util-slf4j-api' though where possible. ``PHAB_ID=D345381``
 
+Runtime Behavior Changes
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+* util: Upgrade to Jackson 2.9.9. ``PHAB_ID=D345969``
+
 19.7.0
 ------
 

build.sbt

@@ -12,7 +12,7 @@ val zkDependency = "org.apache.zookeeper" % "zookeeper" % zkVersion excludeAll(
   ExclusionRule("javax.jms", "jms")
 )
 val slf4jVersion = "1.7.21"
-val jacksonVersion = "2.9.8"
+val jacksonVersion = "2.9.9"
 
 val guavaLib = "com.google.guava" % "guava" % "19.0"
 val caffeineLib = "com.github.ben-manes.caffeine" % "caffeine" % "2.3.4"