Update scala-library to 2.12.13

[scala-steward]

Updates org.scala-lang:scala-library from 2.12.12 to 2.12.13.

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!

Ignore future updates

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

updates.ignore = [ { groupId = "org.scala-lang", artifactId = "scala-library" } ]

labels: library-update, semver-patch

[theon]

Build is failing with a known issue with scoverage and scala 2.12.13. See:
scoverage/sbt-scoverage#321

Need to wait for a new scoverage release

[codecov]

Codecov Report

Merging #274 (cda1bfc) into master (b42a08f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #274   +/-   ##
=======================================
  Coverage   93.77%   93.77%           
=======================================
  Files          29       29           
  Lines         948      948           
  Branches       31       24    -7     
=======================================
  Hits          889      889           
  Misses         59       59           

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