Update zio, zio-streams, zio-test, ... to 2.1.15

📦 Updates
* [dev.zio:zio](https://github.com/zio/zio)
* [dev.zio:zio-streams](https://github.com/zio/zio)
* [dev.zio:zio-test](https://github.com/zio/zio)
* [dev.zio:zio-test-sbt](https://github.com/zio/zio)

 from `2.1.14` to `2.1.15`

📜 [GitHub Release Notes](https://github.com/zio/zio/releases/tag/v2.1.15) - [Version Diff](zio/zio@v2.1.14...v2.1.15)

build.sbt

@@ -42,7 +42,7 @@ lazy val _scala3   = "3.3.5"
 inThisBuild(
   List(
     name         := "ZIO Kafka",
-    zioVersion   := "2.1.14",
+    zioVersion   := "2.1.15",
     scalaVersion := _scala213,
     // zio-sbt defines these 'scala213' and 'scala3' settings, but we need to define them here to override the defaults and better control them
     scala213 := _scala213,