Update scalafmt-core to 3.1.1

[fgrutsch]

Updates org.scalameta:scalafmt-core from 3.0.8 to 3.1.1.
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 = "scalafmt-core" } ]

labels: library-update, early-semver-minor, semver-spec-minor

[codecov-commenter]

Codecov Report

Merging #44 (5d0dc01) into master (c8ab4cd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   92.13%   92.13%           
=======================================
  Files          35       35           
  Lines         267      267           
  Branches        2        2           
=======================================
  Hits          246      246           
  Misses         21       21           

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