Bump undertow-core from 2.0.21.Final to 2.2.15.Final in /rest/light4j#13

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dependabot/maven/rest/light4j/io.undertow-undertow-core-2.2.15.FinalGaryChengld/microservices-examples:dependabot/maven/rest/light4j/io.undertow-undertow-core-2.2.15.FinalCopy head branch name to clipboard