fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-7569538

Author: snyk-bot

pom.xml

@@ -50,7 +50,7 @@
         <http-components.version>4.5.14</http-components.version>
 
         <!-- Jackson version -->
-        <jackson.version>2.14.3</jackson.version>
+        <jackson.version>2.15.0</jackson.version>
 
         <!-- Define which version of junit you'll be running -->
         <junit.version>4.13.2</junit.version>