Update zio-nio to 2.0.0

[scala-steward]

Updates dev.zio:zio-nio from 1.0.0-RC12 to 2.0.0. 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 = "dev.zio", artifactId = "zio-nio" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequests = { frequency = "@monthly" }, dependency = { groupId = "dev.zio", artifactId = "zio-nio" } }] ```

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