fix: pom.xml to reduce vulnerabilities (#27)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-IONETTY-8367012

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

pom.xml

@@ -45,7 +45,7 @@
         <dependency>
             <groupId>io.netty</groupId>
             <artifactId>netty-all</artifactId>
-            <version>4.1.114.Final</version>
+            <version>4.1.115.Final</version>
         </dependency>
 
         <dependency>