Only bump okhttp to 3.4.0 instead of 4.12.0

`play-git-hub` makes use of internal OkHttp APIs which have been removed in 4.x

build.sbt

@@ -43,13 +43,19 @@ libraryDependencies ++= Seq(
   // Introduced through com.typesafe.play:play_2.13:2.9.0
   // No newer version of play available yet.
   "com.typesafe.akka" %% "akka-actor" % "2.8.1",
+  "com.typesafe.akka" %% "akka-actor-typed" % "2.8.1",
+  "com.typesafe.akka" %% "akka-protobuf-v3" % "2.8.1",
+  "com.typesafe.akka" %% "akka-serialization-jackson" % "2.8.1",
+  "com.typesafe.akka" %% "akka-slf4j" % "2.8.1",
+  "com.typesafe.akka" %% "akka-stream" % "2.8.1",
+
   // Introduced through org.webjars:bootstrap:3.4.1
   // Fix available in next major bootstrap version - this will involve a lot of breaking changes however.
   "org.webjars" % "jquery" % "3.6.4",
   // Introduced through com.madgag.play-git-hub:core:5.10
   // No newer version of play-git-hub available yet.
   "org.eclipse.jgit" % "org.eclipse.jgit" % "6.6.1.202309021850-r",
-  "com.squareup.okhttp3" % "okhttp" % "4.12.0"
+  "com.squareup.okhttp3" % "okhttp" % "3.4.0"
 )
 
 routesImport ++= Seq("com.madgag.scalagithub.model._","com.madgag.playgithub.Binders._")