bump jackson to 2.9.8

Author: frantuma

pom.xml

@@ -496,7 +496,7 @@
         <felix-version>3.5.0</felix-version>
         <servlet-api-version>3.1.0</servlet-api-version>
         <jersey2-version>2.26</jersey2-version>
-        <jackson-version>2.9.5</jackson-version>
+        <jackson-version>2.9.8</jackson-version>
         <logback-version>1.2.3</logback-version>
         <classgraph-version>4.6.32</classgraph-version>
         <guava-version>23.0</guava-version>