Update sbt to 1.4.9

[scala-steward]

Updates org.scala-sbt:sbt from 1.4.7 to 1.4.9. GitHub Release Notes - Version Diff

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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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[bot]]

Codecov Report

Merging #261 (fdd2c6d) into master (19c38e4) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #261   +/-   ##
=======================================
  Coverage   93.02%   93.02%           
=======================================
  Files          33       33           
  Lines         502      502           
  Branches        9        9           
=======================================
  Hits          467      467           
  Misses         35       35           

Flag	Coverage Δ
unittests	93.02% <ø> (ø)

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