Fix attribute key macro for scala3

Author: adamw

core/src/main/scala-2/sttp/attributes/AttributeKeyMacro.scala

@@ -6,7 +6,7 @@ private[attributes] object AttributeKeyMacro {
   def apply[T: c.WeakTypeTag](c: blackbox.Context): c.Expr[AttributeKey[T]] = {
     import c.universe._
     c.Expr[AttributeKey[T]](
-      q"new _root_.sttp.tapir.AttributeKey(${c.universe.show(implicitly[c.WeakTypeTag[T]].tpe)})"
+      q"new _root_.sttp.attributes.AttributeKey(${c.universe.show(implicitly[c.WeakTypeTag[T]].tpe)})"
     )
   }
 }

core/src/test/scala/sttp/attributes/AttributeKeyTest.scala

@@ -0,0 +1,13 @@
+package sttp.attributes
+
+import org.scalatest.matchers.should.Matchers
+import org.scalatest.flatspec.AnyFlatSpec
+
+class AttributeKeyTest extends AnyFlatSpec with Matchers {
+  it should "create an attribute key" in {
+    val key = AttributeKey[SomeAttribute]
+    key.typeName shouldBe "sttp.attributes.SomeAttribute"
+  }
+}
+
+case class SomeAttribute(v: String)