Update sbt-scalafmt to 2.4.0

[scala-steward]

Updates org.scalameta:sbt-scalafmt from 2.3.4 to 2.4.0.
GitHub Release Notes - Version Diff

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.

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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.scalameta", artifactId = "sbt-scalafmt" } ]

labels: sbt-plugin-update, semver-minor

[codecov-io]

Codecov Report

Merging #3417 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3417   +/-   ##
=======================================
  Coverage   92.71%   92.71%           
=======================================
  Files         379      379           
  Lines        7986     7986           
  Branches      233      233           
=======================================
  Hits         7404     7404           
  Misses        582      582           

Flag	Coverage Δ
#scala_version_212	92.74% <ø> (ø)
#scala_version_213	92.50% <ø> (ø)

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