Bump io.netty:netty-bom from 4.1.119.Final to 4.2.1.Final

[dependabot[bot]]

Bumps io.netty:netty-bom from 4.1.119.Final to 4.2.1.Final.

Commits

• 72d0cce [maven-release-plugin] prepare release netty-4.2.1.Final
• f1b892b Fix javadoc generation so validation on sonatype works
• 322548c Import gpg key before trying to generate the netty-all artifact during releas...
• a0163a5 Fix windows staging workflow for release
• 6e98c35 [maven-release-plugin] rollback the release of netty-4.2.1.Final
• 9b12420 [maven-release-plugin] prepare for next development iteration
• 647dfea [maven-release-plugin] prepare release netty-4.2.1.Final
• 4f74d56 Use the correct working directory during staging of windows artifacts
• e9de551 Fix staging for windows during release of 4.2
• fa97ee9 Make public API specify explicit maxAllocation to prevent OOM (#15005)
• Additional commits viewable in compare view

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