avoid infix with _*. prepare Scala 3

[xuwei-k]

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Helpful things

Fixes

Purpose

fix compile error with Scala 3.

Background Context

playframework/core/play/src/main/scala/play/api/libs/typedmap/TypedMap.scala

Line 94 in 6e614d1

def +(entries: TypedEntry[_]*): TypedMap

[error] 99 |    withAttrs(attrs + (entries: _*))
[error]    |                                ^
[error]    |          `_*` can be used only for last argument of method application.
[error]    |          It is no longer allowed in operands of infix operations.

Welcome to Scala 3.1.2 (11.0.15, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.

scala> object A { def +(xs: Int*): Unit = () }
// defined object A

scala> def a(xs: Int*) = A + (xs: _*)
-- Error: ----------------------------------------------------------------------
1 |def a(xs: Int*) = A + (xs: _*)
  |                           ^
  |            `_*` can be used only for last argument of method application.
  |            It is no longer allowed in operands of infix operations.

scala> def a(xs: Int*) = A.+(xs: _*)
def a(xs: Int*): Unit

References

• Fix #8715: enforce syntax for _* (alternate version) scala/scala3#8753
• Scala 3 #11260

[octonato]

LGTM