Update scalafmt-core to 3.1.0

[scala-steward]

Updates org.scalameta:scalafmt-core from 3.0.8 to 3.1.0.
GitHub Release Notes - Version Diff

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

[codecov-commenter]

Codecov Report

Merging #408 (23632dd) into master (8e05569) will increase coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #408      +/-   ##
==========================================
+ Coverage   99.27%   99.51%   +0.24%     
==========================================
  Files           8        8              
  Lines         412      412              
  Branches       41       41              
==========================================
+ Hits          409      410       +1     
+ Misses          3        2       -1     

Impacted Files	Coverage Δ
core/src/main/scala/org/typelevel/paiges/Doc.scala	99.57% <0.00%> (+0.42%)	⬆️

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