Update coursier to 2.1.0-RC1

[scala-steward]

Updates io.get-coursier:coursier from 2.1.0-M7-39-gb8f3d7532 to 2.1.0-RC1.
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 = "io.get-coursier", artifactId = "coursier" } ]

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

dependencyOverrides = [{
  pullRequests = { frequency = "@monthly" },
  dependency = { groupId = "io.get-coursier", artifactId = "coursier" }
}]

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

[adpi2]

Superseded by #429