Update sbt-typelevel-ci-release to 0.4.21

[lucuma-steward]

Updates org.typelevel:sbt-typelevel-ci-release from 0.4.20 to 0.4.21.
GitHub Release Notes - Version Diff

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

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

Configure Scala Steward for your repository with a .scala-steward.conf file.

Have a fantastic day writing Scala!

Adjust future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "org.typelevel", artifactId = "sbt-typelevel-ci-release" } ]

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

dependencyOverrides = [{
  pullRequests = { frequency = "30 days" },
  dependency = { groupId = "org.typelevel", artifactId = "sbt-typelevel-ci-release" }
}]

labels: sbt-plugin-update, early-semver-minor, semver-spec-patch, version-scheme:early-semver, commit-count:n:2

[milessabin]

@armanbilge do you know why this is messing around with the build matrix?

[armanbilge]

do you know why this is messing around with the build matrix?

Yes, this is a fix :)

• Don't do ++ scalaVersion in publish job sbt-typelevel#502

[milessabin]

LGTM!