Update sbt to 1.3.8

[scala-steward]

Updates org.scala-sbt:sbt from 1.3.7 to 1.3.8.
Release Notes/Changelog

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.

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-sbt", artifactId = "sbt" } ]

labels: library-update, semver-patch

[codecov-io]

Codecov Report

Merging #3284 into master will increase coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3284      +/-   ##
==========================================
+ Coverage   93.14%   93.39%   +0.24%     
==========================================
  Files         378      372       -6     
  Lines        7575     7300     -275     
  Branches      212      179      -33     
==========================================
- Hits         7056     6818     -238     
+ Misses        519      482      -37

Flag	Coverage Δ
#scala_version_212	93.39% <ø> (ø)	⬆️
#scala_version_213	?

Impacted Files	Coverage Δ
...in/scala/cats/data/AbstractNonEmptyInstances.scala	96.55% <0%> (-3.45%)	⬇️
...e/src/main/scala-2.13+/cats/data/ZipLazyList.scala
....13+/cats/kernel/instances/LazyListInstances.scala
.../main/scala-2.13+/cats/data/NonEmptyLazyList.scala
....13+/cats/kernel/instances/ArraySeqInstances.scala
...src/main/scala-2.13+/cats/instances/arraySeq.scala
...src/main/scala-2.13+/cats/instances/lazyList.scala

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