Update specs2-core, specs2-mock to 4.20.8

[scala-steward]

About this PR

📦 Updates

• org.specs2:specs2-core
• org.specs2:specs2-mock

from 4.11.0 to 4.20.8

Usage

✅ Please merge!

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 = "org.specs2" } ]

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

dependencyOverrides = [{
  pullRequests = { frequency = "30 days" },
  dependency = { groupId = "org.specs2" }
}]

^{labels: test-library-update, early-semver-minor, semver-spec-minor, version-scheme:semver-spec, commit-count:1}