Update non-major netty dependencies to v4.2.0.Final (master)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.netty:netty-transport (source)	4.1.119.Final -> 4.2.0.Final
io.netty:netty-handler (source)	4.1.119.Final -> 4.2.0.Final
io.netty:netty-common (source)	4.1.119.Final -> 4.2.0.Final
io.netty:netty-codec-http (source)	4.1.119.Final -> 4.2.0.Final
io.netty:netty-codec (source)	4.1.119.Final -> 4.2.0.Final
io.netty:netty-buffer (source)	4.1.119.Final -> 4.2.0.Final

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