Merge pull request #286 from scala-steward/update/circe-core-0.12.3

Update circe-core, circe-generic, ... to 0.12.3

build.sbt

@@ -295,7 +295,7 @@ lazy val library =
       val parboiled     = "2.1.8"
       val scalaCheck    = "1.14.2"
       val sangriaCirce  = "1.2.1"
-      val circe         = "0.12.2"
+      val circe         = "0.12.3"
       val diffson       = "4.0.0"
       val sangria       = "1.4.2"
       val fansi         = "0.2.7"