Update akka-actor to 2.6.19

Author: scala-steward

build.sbt

@@ -64,7 +64,7 @@ val testSettings = commonSettings ++ Seq(
 val tagging = "com.softwaremill.common" %% "tagging" % "2.3.1"
 val scalatest = "org.scalatest" %% "scalatest" % "3.2.9"
 val javassist = "org.javassist" % "javassist" % "3.28.0-GA"
-val akkaActor = "com.typesafe.akka" %% "akka-actor" % "2.6.15"
+val akkaActor = "com.typesafe.akka" %% "akka-actor" % "2.6.19"
 val javaxInject = "javax.inject" % "javax.inject" % "1"
 val cats = "org.typelevel" %% "cats-core" % "2.6.1"
 val catsEffect = "org.typelevel" %% "cats-effect" % "3.2.1"