fix(deps): update non-major netty dependencies to v4.2.1.final

Author: renovate[bot]

gradle/libs.versions.toml

@@ -37,7 +37,7 @@ mockito = "5.17.0"
 modbus = "1.2.2"
 mqtt-sn-codec = "838f51d691"
 mtconnect-protocol = "1.0.0"
-netty = "4.2.0.Final"
+netty = "4.2.1.Final"
 org_json = "20250107"
 pmd = "6.55.0"
 shrinkwrap = "1.2.6"