Upgrade to Netty 4.1.54.Final

Closes gh-24129

Author: snicoll

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -1177,7 +1177,7 @@ bom {
 			]
 		}
 	}
-	library("Netty", "4.1.53.Final") {
+	library("Netty", "4.1.54.Final") {
 		group("io.netty") {
 			imports = [
 				"netty-bom"