Update undertow-core to 2.3.0.Final

[scalameta-bot]

Updates io.undertow:undertow-core from 2.2.20.Final to 2.3.0.Final.
GitHub Release Notes - Version Diff

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Adjust future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "io.undertow", artifactId = "undertow-core" } ]

Or, add this to slow down future updates of this dependency:

dependencyOverrides = [{
  pullRequests = { frequency = "@monthly" },
  dependency = { groupId = "io.undertow", artifactId = "undertow-core" }
}]

labels: library-update, commit-count:1