Anthropic should throw AnthropicScalaClientExceptions, upgrade scala mock to 6.0.0 to compile with Scala 3

Author: bburdiliak

anthropic-client/src/test/scala/io/cequence/openaiscala/anthropic/service/impl/TestFactory.scala

@@ -28,8 +28,7 @@ class TestAnthropicServiceImpl(
 )(
  implicit override val ec: ExecutionContext,
  override val materializer: Materializer
-) extends AnthropicServiceClassImpl(coreUrl, requestContext)
- with MockFactory {
+) extends AnthropicServiceClassImpl(coreUrl, requestContext) {
 
  val defaultAcceptableStatusCodes = Seq(200, 201, 202, 204)