fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-2421244
- https://snyk.io/vuln/SNYK-JAVA-ORGPOSTGRESQL-2401816

pom.xml

@@ -107,7 +107,7 @@
         <dependency>
             <groupId>net.logstash.logback</groupId>
             <artifactId>logstash-logback-encoder</artifactId>
-            <version>6.4</version>
+            <version>7.0</version>
         </dependency>