Update jsoniter-scala-core to 2.28.4 (#326)

Author: scala-steward

project/Dependencies.scala

@@ -13,6 +13,6 @@ object Dependencies {
     val doobie = "1.0.0-RC5"
     val circe = "0.14.6"
     val upickle = "3.2.0"
-    val jsoniter = "2.28.3"
+    val jsoniter = "2.28.4"
   }
 }