Update sbt-scoverage to 1.6.0

[scala-steward]

Updates org.scoverage:sbt-scoverage from 1.6.0-M3 to 1.6.0.

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 @scala-steward in the comments below.

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.scoverage", artifactId = "sbt-scoverage" }]

labels: semver-pre-release

[codecov-io]

Codecov Report

Merging #2901 into master will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2901      +/-   ##
==========================================
+ Coverage    94.2%   94.26%   +0.06%     
==========================================
  Files         368      363       -5     
  Lines        6949     6944       -5     
  Branches      309      171     -138     
==========================================
  Hits         6546     6546              
+ Misses        403      398       -5

Impacted Files	Coverage Δ
...ala-2.12-/cats/kernel/compat/TraversableOnce.scala
...12-/cats/kernel/compat/WrappedMutableMapBase.scala
...e/src/main/scala-2.12-/cats/compat/SortedSet.scala
...2.12-/alleycats/compat/IterableEmptyInstance.scala
...in/scala-2.12-/cats/kernel/compat/HashCompat.scala

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