Bump netty to 4.1.52.Final

Netty has some improvements which may be relevant to us,
bumping for the purpose of pulling these and, we might as well.

BungeeCord-Patches/0060-Bump-netty-version.patch

@@ -0,0 +1,22 @@
+From 2b4366606edf12a1841ae016ce19a8188f38abff Mon Sep 17 00:00:00 2001
+From: Shane Freeder <theboyetronic@gmail.com>
+Date: Sun, 27 Sep 2020 18:37:38 +0100
+Subject: [PATCH] Bump netty version
+
+
+diff --git a/pom.xml b/pom.xml
+index 3ca7ca91..3ddd74d4 100644
+--- a/pom.xml
++++ b/pom.xml
+@@ -91,7 +91,7 @@
+ 
+     <properties>
+         <build.number>unknown</build.number>
+-        <netty.version>4.1.49.Final</netty.version>
++        <netty.version>4.1.52.Final</netty.version>
+         <maven.compiler.source>1.8</maven.compiler.source>
+         <maven.compiler.target>1.8</maven.compiler.target>
+         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+-- 
+2.28.0
+