Bump undertow-core from 1.0.0.Beta30 to 2.1.6.Final in /resteasy-netty-example#55

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dependabot/maven/resteasy-netty-example/io.undertow-undertow-core-2.1.6.Finalmposolda/misc:dependabot/maven/resteasy-netty-example/io.undertow-undertow-core-2.1.6.FinalCopy head branch name to clipboard