fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-CHQOSLOGBACK-6097492
- https://snyk.io/vuln/SNYK-JAVA-CHQOSLOGBACK-6097493

pom.xml

@@ -111,7 +111,7 @@
         dropped Groovy support (https://jira.qos.ch/browse/LOGBACK-1606). So we're stuck with 1.2.8 for
         the time being. The vulnerability requires access to the config file, though, so it's not that critical.
         -->
-        <logback.version>1.2.8</logback.version>
+        <logback.version>1.2.13</logback.version>
         <ognl.version>3.2.10</ognl.version>
         <quartz.version>2.3.2</quartz.version>
         <resteasy.version>4.7.8.Final</resteasy.version>