Fix warnings with Scala 3.9

[xuwei-k]

Welcome to Scala 3.9.0 (21.0.12, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.
                                                                                                                                            
scala> def foo(implicit x: Int): Int = x
def foo(implicit x: Int): Int
                                                                                                                                            
scala> foo(2)
1 warning found
-- Warning: --------------------------------------------------------------------
1 |foo(2)
  |    ^
  |Implicit parameters should be provided with a `using` clause.
  |To disable the warning, please use the following option:
  |  "-Wconf:msg=Implicit parameters should be provided with a `using` clause:s"
val res0: Int = 2
                                                                                                                                            
scala> foo(using 2)
val res1: Int = 2

[satorg]

Makes sense, thank you!
Curiously, it was partially addressed in #4806, but apparently not everything was cleaned up back then.