Update scalafmt-core to 3.1.1 (#403)

* Update scalafmt-core to 3.1.1

* Specify runner dialect explicitly

Co-authored-by: Georgi Krastev <joro.kr.21@gmail.com>

.scalafmt.conf

@@ -1,4 +1,5 @@
-version = "3.0.8"
+version = "3.1.1"
+runner.dialect = scala213
 align.preset = none
 maxColumn = 120
 includeNoParensInSelectChains = false
@@ -9,3 +10,4 @@ rewrite.redundantBraces.stringInterpolation = true
 rewrite.redundantBraces.methodBodies = true
 rewrite.redundantBraces.generalExpressions = true
 rewriteTokens = { "⇒": "=>", "→": "->", "←": "<-" }
+fileOverride { "glob:**/*.sbt" { runner.dialect = scala212 } }