Update scalafmt-core to 3.8.6 (#59)

Co-authored-by: scala-steward <scala-steward>

Author: github-actions[bot]

.scalafmt.conf

@@ -1,4 +1,4 @@
-version        = 3.8.0
+version        = 3.8.6
 maxColumn      = 140
 rewrite.rules  = [RedundantBraces, RedundantParens, SortImports]
 runner.dialect = scala3