Update zio-prelude to 1.0.0-RC15

[scala-steward]

Updates dev.zio:zio-prelude from 1.0.0-RC13 to 1.0.0-RC15.
GitHub Release Notes - Version Diff

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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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 = "dev.zio", artifactId = "zio-prelude" } ]

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

dependencyOverrides = [{
  pullRequests = { frequency = "@monthly" },
  dependency = { groupId = "dev.zio", artifactId = "zio-prelude" }
}]

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