Update netty monorepo to v4.2.15.Final

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
io.netty:netty-transport (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-transport-native-unix-common (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-transport-native-kqueue (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-transport-native-epoll (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-resolver-dns (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-resolver (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-handler-proxy (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-handler (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-common (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-codec-socks (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-codec-http2 (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-codec-http (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-codec-dns (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-codec (source)	4.1.59.Final → 4.2.15.Final
io.netty:netty-buffer (source)	4.1.59.Final → 4.2.15.Final

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