Update zio-json to 0.3.0-RC6

[scala-steward]

Updates dev.zio:zio-json from 0.3.0-RC3 to 0.3.0-RC6. GitHub Release Notes - Version Diff

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updates.ignore = [ { groupId = "dev.zio", artifactId = "zio-json" } ]

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