Update sbt to 1.3.9

[scala-steward]

Updates org.scala-sbt:sbt from 1.3.8 to 1.3.9.

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-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.75%. Comparing base (339416a) to head (37a268b).
⚠️ Report is 2 commits behind head on master.
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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #60   +/-   ##
=======================================
  Coverage   93.75%   93.75%           
=======================================
  Files           1        1           
  Lines          16       16           
=======================================
  Hits           15       15           
  Misses          1        1           

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