Update undertow-core to 2.3.20.Final#457

scala-steward wants to merge 1 commit intoscalapb:masterscalapb/scalapb-validate:masterfrom

scala-steward:update/undertow-core-2.3.20.Finalscala-steward/scalapb-validate:update/undertow-core-2.3.20.FinalCopy head branch name to clipboard