Bump undertow-core from 1.3.15.Final to 2.1.6.Final in /undertow-sample#54

dependabot[bot] wants to merge 1 commit intomastermposolda/misc:masterfrom

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