Bump undertow-core from 1.4.0.Final to 2.1.6.Final in /samples/server/petstore/java-undertow#59

dependabot[bot] wants to merge 5 commits intomastertransparencies/openapi-generator:masterfrom

dependabot/maven/samples/server/petstore/java-undertow/io.undertow-undertow-core-2.1.6.Finaltransparencies/openapi-generator:dependabot/maven/samples/server/petstore/java-undertow/io.undertow-undertow-core-2.1.6.FinalCopy head branch name to clipboard