Update directory-watcher to 0.15.1

[scalameta-bot]

Updates io.methvin:directory-watcher from 0.15.0 to 0.15.1.
GitHub Release Notes - Version Diff

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updates.ignore = [ { groupId = "io.methvin", artifactId = "directory-watcher" } ]

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