Update scalatest to 3.2.12

[scala-steward]

Updates org.scalatest:scalatest from 3.2.10 to 3.2.12.

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.scalatest", artifactId = "scalatest" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequest = { frequency = "@monthly" }, dependency = { groupId = "org.scalatest", artifactId = "scalatest" } }] ```

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

[ckipp01]

Closing since I won't be merging anything else into the actual current main branch, and will actually make the current v2 the main branch in a bit.