add parentheses. prepare sbt 2.x

[xuwei-k]

sbt 2.x will be build with Scala 3.x. Scala 3.x require parentheses

https://www.scala-sbt.org/2.x/docs/en/changes/migrating-from-sbt-1.x.html

Welcome to Scala 3.3.4 (21.0.4, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.
                                                                                                                                           
scala> List(2).map{ a => a }
val res0: List[Int] = List(2)
                                                                                                                                           
scala> List(2).map{ a: Int => a }
-- Error: ----------------------------------------------------------------------
1 |List(2).map{ a: Int => a }
  |                    ^
  |                 parentheses are required around the parameter of a lambda
                                                                                                                                           
scala> List(2).map{ (a: Int) => a }
val res1: List[Int] = List(2)