Bump io.netty:netty-bom from 4.1.122.Final to 4.2.9.Final

[dependabot[bot]]

Bumps io.netty:netty-bom from 4.1.122.Final to 4.2.9.Final.

Commits

• a853a39 [maven-release-plugin] prepare release netty-4.2.9.Final
• 6d29a4f Add missing publishing config for the bom module
• ea911de Optimize HTTP startline validation (#16030)
• d7108a3 LocalChannel: Reduce GC by re-using same Runnable (#16014)
• 207afcb Fix MpscIntQueue bug (#16023)
• 27bfd56 Fix HTTP startline validation (#16022)
• 40ab418 [maven-release-plugin] prepare for next development iteration
• e2d9d11 [maven-release-plugin] prepare release netty-4.2.8.Final
• 2f2e437 Merge commit from fork
• d011634 Build fixes to allow using the epoll native transport on Android (#16016)
• Additional commits viewable in compare view

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