use scala.reflect.ClassTag instead of deprecated Manifest

[xuwei-k]

$ scala -deprecation
Welcome to Scala 3.3.4 (21.0.4, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.
                                                                                                                                             
scala> implicitly[Manifest[Int]]
1 warning found
-- Deprecation Warning: --------------------------------------------------------
1 |implicitly[Manifest[Int]]
  |                         ^
  |Compiler synthesis of Manifest and OptManifest is deprecated, instead
  |replace with the type `scala.reflect.ClassTag[Int]`.
  |Alternatively, consider using the new metaprogramming features of Scala 3,
  |see https://docs.scala-lang.org/scala3/reference/metaprogramming.html
val res0: Manifest[Int] = Int
                                                                                                                                             
scala> implicitly[scala.reflect.ClassTag[Int]]
val res1: scala.reflect.ClassTag[Int] = Int

[unkarjedy]

Thanks for the PR!