Update core_2.13 to 3.8.16 (#2270)

Author: scala-steward

project/deps.sc

@@ -176,7 +176,7 @@ object Deps {
       .exclude(("com.github.plokhotnyuk.jsoniter-scala", "jsoniter-scala-core_3"))
       .exclude(("com.github.plokhotnyuk.jsoniter-scala", "jsoniter-scala-macros_3"))
   def slf4jNop                = ivy"org.slf4j:slf4j-nop:2.0.7"
-  def sttp                    = ivy"com.softwaremill.sttp.client3:core_2.13:3.8.15"
+  def sttp                    = ivy"com.softwaremill.sttp.client3:core_2.13:3.8.16"
   def svm                     = ivy"org.graalvm.nativeimage:svm:$graalVmVersion"
   def swoval                  = ivy"com.swoval:file-tree-views:2.1.10"
   def testInterface           = ivy"org.scala-sbt:test-interface:1.0"