Upgrade Netty to 4.1.99.Final (#590)

This addresses:

* CVE-2021-37136
* CVE-2021-37137
* CVE-2022-41915

It also fixes a bug when using JDK21+.

Author: wborn

gradle.properties

@@ -5,7 +5,7 @@ prevVersion=1.3.1
 #
 rxjava.version=2.2.21
 reactive-streams.version=1.0.4
-netty.version=4.1.48.Final
+netty.version=4.1.99.Final
 jctools.version=2.1.2
 annotations.version=16.0.3
 dagger.version=2.27