Update client4:core to 4.0.15 (#89)

Author: softwaremill-ci

build.sbt

@@ -53,7 +53,7 @@ lazy val examples = (project in file("examples"))
     publishArtifact := false,
     name := "examples",
     libraryDependencies ++= Seq(
-      "com.softwaremill.sttp.client4" %% "core" % "4.0.14",
+      "com.softwaremill.sttp.client4" %% "core" % "4.0.15",
       "com.softwaremill.sttp.tapir" %% "tapir-netty-server-sync" % tapirV,
       "ch.qos.logback" % "logback-classic" % "1.5.25"
     ),