fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-IONETTY-14423947

Author: snyk-bot

pom.xml

@@ -57,7 +57,7 @@
         <slf4j.version>2.0.6</slf4j.version>
         <jackson.version>2.14.2</jackson.version>
         <velocity.version>2.3</velocity.version>
-        <netty.version>4.1.89.Final</netty.version>
+        <netty.version>4.1.129.Final</netty.version>
         <httpcomponents.version>4.4.1</httpcomponents.version>
         <bouncycastle.version>1.72</bouncycastle.version>
         <!-- highest spring version is 5.3 due to Java 1.8 version -->