fix: pom.xml to reduce vulnerabilities (#46)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-3038424

Author: snyk-bot

pom.xml

@@ -49,7 +49,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-        <com.fasterxml.jackson.version>2.13.3</com.fasterxml.jackson.version>
+        <com.fasterxml.jackson.version>2.13.4</com.fasterxml.jackson.version>
         <junit.version>5.7.0</junit.version>
         <org.mockito.version>3.6.28</org.mockito.version>
         <org.slf4j.version>1.7.30</org.slf4j.version>