Update http4s-core, http4s-laws, ... to 0.23.28 in series/0.23

Author: http4s-steward[bot]

build.sbt

@@ -11,7 +11,7 @@ ThisBuild / scalaVersion := Scala213
 
 lazy val root = project.in(file(".")).aggregate(scalaXml2, scalaXml1).enablePlugins(NoPublishPlugin)
 
-val http4sVersion = "0.23.27"
+val http4sVersion = "0.23.28"
 val scalacheckXmlVersion = "0.1.0"
 val scalaXml1Version = "1.3.1"
 val scalaXml2Version = "2.3.0"