fix: benchmark/pom.xml to reduce vulnerabilities (#2364)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-IONETTY-6483812

Co-authored-by: snyk-bot <[email protected]>

Author: velo

benchmark/pom.xml

@@ -30,7 +30,7 @@
     <jmh.version>1.37</jmh.version>
     <rx.netty.version>0.5.3</rx.netty.version>
     <rx.java.version>1.3.8</rx.java.version>
-    <netty.version>4.1.107.Final</netty.version>
+    <netty.version>4.1.108.Final</netty.version>
     <main.basedir>${project.basedir}/..</main.basedir>
 
     <moditect.skip>true</moditect.skip>