Update plantuml to 1.2023.4

[scala-steward]

Updates net.sourceforge.plantuml:plantuml from 1.2023.2 to 1.2023.4. 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 = "net.sourceforge.plantuml", artifactId = "plantuml" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequests = { frequency = "30 days" }, dependency = { groupId = "net.sourceforge.plantuml", artifactId = "plantuml" } }] ```

labels: library-update, early-semver-patch, semver-spec-patch, commit-count:1

[scala-steward]

Superseded by #241.