Update cats-effect to 2.3.1

[47erbot]

Updates org.typelevel:cats-effect from 2.2.0 to 2.3.1.
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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Files still referring to the old version number

The following files still refer to the old version number (2.2.0).
You might want to review and update them manually.

project/ProjectPlugin.scala 

Ignore future updates

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

updates.ignore = [ { groupId = "org.typelevel", artifactId = "cats-effect" } ] 

labels: library-update, semver-minor, old-version-remains