fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-72445
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-72446
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-72447

Author: snyk-bot

pom.xml

@@ -53,7 +53,7 @@
         <http-components.version>4.5.5</http-components.version>
 
         <!-- Jackson version -->
-        <jackson.version>2.9.5</jackson.version>
+        <jackson.version>2.9.6</jackson.version>
 
         <!-- Define which version of junit you'll be running -->
         <junit.version>4.12</junit.version>