Update scalacheck to 1.15.3

[scala-steward]

Updates org.scalacheck:scalacheck from 1.14.3 to 1.15.3.
GitHub Release Notes - Changelog - Version Diff

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

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Ignore future updates

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

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labels: library-update, semver-minor

[stevedlawrence]

+1

• Do all automated continuous integration checks pass?
  Yes
• Is the update a patch, minor, or major update?
  Minor update, changelog doesn't mention anything that affects our minimal usage of scalacheck. Also verified that passera tests run, which is the only place scalacheck is used.
• Is the license still compatible with ASF License Policy?
  Yes, BSD-3
• Have any changes been made to LICENSE/NOTICE files that need to be incorporated?
  No changes to license type. No NOTICE file. Note that we do not include this license in any release artifcats because we do not distribute scalacheck.
• Have any transitive dependencies been added or changed?
  No changes to transitive dependencies

[tuxji]

+1