Update client3:core to 3.9.7 (#489)

Author: scala-steward

build.sbt

@@ -55,7 +55,7 @@ val Versions = new {
   val jsoniter = "2.21.4"
   val monix = "3.4.1"
   val scalaTest = "3.2.18"
-  val sttp = "3.3.18"
+  val sttp = "3.9.7"
   val refined = "0.10.3"
   val scalaCache = "1.0.0-M6"
 }