Update sbt, scripted-plugin to 1.3.9

[scala-steward]

Updates

• org.scala-sbt:sbt
• org.scala-sbt:scripted-plugin

from 1.2.8 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" } ]

labels: library-update, semver-minor

[coveralls]

Coverage remained the same at 87.736% when pulling a0c34a4 on scala-steward:update/sbt-1.3.9 into f23bb5b on iheartradio:master.