Update circe-generic, ... to 0.12.0-M4 (#328)

Author: scala-steward

build.sbt

@@ -137,9 +137,9 @@ lazy val `jsoniter-scala-benchmark` = project
       "com.fasterxml.jackson.module" %% "jackson-module-scala" % "2.9.9",
       "com.fasterxml.jackson.module" % "jackson-module-afterburner" % "2.9.9",
       "com.fasterxml.jackson.datatype" % "jackson-datatype-jdk8" % "2.9.9",
-      "io.circe" %% "circe-generic" % "0.12.0-M3",
-      "io.circe" %% "circe-generic-extras" % "0.12.0-M3",
-      "io.circe" %% "circe-parser" % "0.12.0-M3",
+      "io.circe" %% "circe-generic" % "0.12.0-M4",
+      "io.circe" %% "circe-generic-extras" % "0.12.0-M4",
+      "io.circe" %% "circe-parser" % "0.12.0-M4",
       "com.typesafe.play" %% "play-json" % "2.7.4",
       "org.julienrf" %% "play-json-derived-codecs" % "6.0.0",
       "ai.x" %% "play-json-extensions" % "0.40.2",