Update http4s-blaze-client, http4s-circe to 0.23.8

build.sbt

@@ -14,9 +14,9 @@ addCommandAlias("ci-publish", ";github; ci-release")
 lazy val V = new {
   val cats: String                = "2.7.0"
   val collectioncompat: String    = "2.6.0"
-  val github4s: String            = "0.28.5"
-  val http4s: String              = "0.21.31"
-  val runtime: String             = "0.6.4"
+  val github4s: String            = "0.30.0"
+  val http4s: String              = "0.23.8"
+  val runtime: String             = "0.7.0"
   val scala: String               = "2.13.8"
   val scala212: String            = "2.12.15"
   val scalacheck: String          = "1.15.4"

compiler/src/main/scala/org/scalaexercises/exercises/compiler/Compiler.scala

@@ -24,11 +24,10 @@ import cats.implicits._
 import github4s.Github
 import Comments.Mode
 import CommentRendering.RenderedComment
-import cats.effect.{ContextShift, IO}
+import cats.effect.IO
+import cats.effect.unsafe.IORuntime
 import github4s.domain.Commit
-import org.http4s.client.blaze.BlazeClientBuilder
-
-import scala.concurrent.ExecutionContext
+import org.http4s.blaze.client.BlazeClientBuilder
 
 class CompilerJava {
   def compile(
@@ -59,10 +58,9 @@ case class Compiler() {
 
   lazy val sourceTextExtractor = new SourceTextExtraction()
 
-  implicit val cs: ContextShift[IO] = IO.contextShift(ExecutionContext.global)
-  implicit val ec: ExecutionContext = ExecutionContext.global
+  implicit val ioRuntime: IORuntime = IORuntime.global
 
-  lazy val clientResource = BlazeClientBuilder[IO](ec).resource
+  lazy val clientResource = BlazeClientBuilder[IO].resource
 
   def compile(
       library: Library,