fix compile error with JDK 23

[xuwei-k]

https://bugs.openjdk.org/browse/JDK-8305457

[error] sbt-assempby-project-dir/src/main/scala/sbtassembly/Assembly.scala:355:13: reference to IO is ambiguous;
[error] it is imported twice in the same scope by
[error] import java.io._
[error] and import sbt.{File, Logger, _}
[error]             IO.delete(output)
[error]             ^
[error] sbt-assempby-project-dir/src/main/scala/sbtassembly/Assembly.scala:371:13: reference to IO is ambiguous;
[error] it is imported twice in the same scope by
[error] import java.io._
[error] and import sbt.{File, Logger, _}
[error]             IO.delete(outputWithHash)
[error]             ^
[error] sbt-assempby-project-dir/src/main/scala/sbtassembly/Assembly.scala:379:31: reference to IO is ambiguous;
[error] it is imported twice in the same scope by
[error] import java.io._
[error] and import sbt.{File, Logger, _}
[error]               if (tmp.exists) IO.delete(tmp)
[error]                               ^
[error] sbt-assempby-project-dir/src/main/scala/sbtassembly/Assembly.scala:381:15: reference to IO is ambiguous;
[error] it is imported twice in the same scope by
[error] import java.io._
[error] and import sbt.{File, Logger, _}
[error]               IO.write(builtAssemblyJar, shellScript.map(_ + "\n").mkString, append = false)
[error]               ^
[error] sbt-assempby-project-dir/src/main/scala/sbtassembly/Assembly.scala:381:78: not found: value append
[error]               IO.write(builtAssemblyJar, shellScript.map(_ + "\n").mkString, append = false)
[error]                                                                              ^
[error] sbt-assempby-project-dir/src/main/scala/sbtassembly/Assembly.scala:382:69: reference to IO is ambiguous;
[error] it is imported twice in the same scope by
[error] import java.io._
[error] and import sbt.{File, Logger, _}
[error]               Using.fileOutputStream(true)(builtAssemblyJar)(out => IO.transfer(tmp, out))
[error]                                                                     ^
[error] sbt-assempby-project-dir/src/main/scala/sbtassembly/Assembly.scala:383:15: reference to IO is ambiguous;
[error] it is imported twice in the same scope by
[error] import java.io._
[error] and import sbt.{File, Logger, _}
[error]               IO.delete(tmp)
[error]               ^
[error] sbt-assempby-project-dir/src/main/scala/sbtassembly/Assembly.scala:533:13: reference to IO is ambiguous;
[error] it is imported twice in the same scope by
[error] import java.io._
[error] and import sbt.{File, Logger, _}
[error]             IO.delete(previousOutput.get)
[error]             ^
[error] sbt-assempby-project-dir/src/main/scala/sbtassembly/Assembly.scala:566:15: reference to IO is ambiguous;
[error] it is imported twice in the same scope by
[error] import java.io._
[error] and import sbt.{File, Logger, _}
[error]               IO.transfer(inputStream, outputStream)
[error]               ^

[eed3si9n]

Thanks!