Update webjars-play to 2.8.18

[scala-steward-intracer[bot]]

Updates org.webjars:webjars-play from 2.6.3 to 2.8.18. 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 = "org.webjars", artifactId = "webjars-play" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequests = { frequency = "30 days" }, dependency = { groupId = "org.webjars", artifactId = "webjars-play" } }] ```

labels: library-update, early-semver-minor, semver-spec-minor, version-scheme:semver-spec, commit-count:1