fix: benchmark/pom.xml to reduce vulnerabilities (#1618)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-IONETTY-2812456

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

benchmark/pom.xml

@@ -30,8 +30,7 @@
     <jmh.version>1.35</jmh.version>
     <rx.netty.version>0.5.3</rx.netty.version>
     <rx.java.version>1.3.8</rx.java.version>
-    <netty.version>4.1.76.Final</netty.version>
-
+    <netty.version>4.1.77.Final</netty.version>
     <main.basedir>${project.basedir}/..</main.basedir>
   </properties>