Update scalafmt-core to 3.8.6

Author: scala-steward-bot

.scalafmt.conf

@@ -9,4 +9,4 @@ continuationIndent.extendSite = 2
 includeCurlyBraceInSelectChains = false
 optIn.breakChainOnFirstMethodDot = false
 align.preset = none
-version = "3.8.5"
+version = "3.8.6"