Update scalafmt-core to 3.0.0-RC6

[scala-steward]

Updates org.scalameta:scalafmt-core from 3.0.0-RC3 to 3.0.0-RC6.
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.scalameta", artifactId = "scalafmt-core" } ]

labels: library-update, semver-pre-release

[codecov-commenter]

Codecov Report

Merging #161 (298e39d) into develop (6676de8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #161   +/-   ##
========================================
  Coverage    50.00%   50.00%           
========================================
  Files            5        5           
  Lines           84       84           
========================================
  Hits            42       42           
  Misses          42       42           

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