Update scalafmt-core to 3.8.6 (fun-stack#316)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: scala-steward

.scalafmt.conf

@@ -1,4 +1,4 @@
-version = 3.8.5
+version = 3.8.6
 
 runner.dialect                  = scala213source3
 style                           = defaultWithAlign