Update sbt to 1.4.3

[scala-steward]

Updates org.scala-sbt:sbt from 1.3.13 to 1.4.3.
GitHub Release Notes - Version Diff

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labels: library-update, semver-minor

[mkurz]

Now we run into another problem in sbt 1.4.x: I am pretty sure it's sbt/sbt#6094
A fix for 0.13.x landed a couple of hours ago already: sbt/sbt#6091 (fixes sbt/sbt#6090).
However we have to wait for a fix for sbt 1.2.8, because I think that's what the Play sbt scripted tests are using.

A workaround however would be to just set

scriptedBatchExecution := false

see sbt/sbt#6054.

I think however it's better to just wait for sbt 1.4.4...