Format scala-3 MacroCompat with scala3 runner

[valencik]

This was originally in #225 which I am trying to minimize by plucking things out of it.

This PR updates scalafmt to the latest "3.5.4", and formats the scala-3 MacroCompat files which were previously excluded.
Additionally, this formats munit/shared/src/main/scala-2/munit/internal/MacroCompat.scala as the previous regex actually matches on scala-

[armanbilge]

Exclude, vs fileOverride?

fileOverride {
  "glob:**/src/{main,test}/scala-3/**" {
    runner.dialect = scala3
  }
}

https://github.com/typelevel/cats/blob/9732f90a4891346fe7979918e606be32b01eef26/.scalafmt.conf#L15

[valencik]

I changed the .scalafmt.conf to use the suggested:

fileOverride {
  "glob:**/src/{main,test}/scala-3/**" {
    runner.dialect = scala3
  }
}

Unfortunately, I ran into a weird issue where scalafmt, with dialect scala3 formats munit/shared/src/main/scala-3/munit/internal/MacroCompat.scala successfully but then fails to be able to format it again (or to check if it is formatted)!

Prior to this PR we have the following line in munit/shared/src/main/scala-3/munit/internal/MacroCompat.scala

implicit def generate[T](value: T): Clue[T] = macro MacroCompatScala2.clueImpl

scalafmt, with dialect scala3 breaks up this line into:

implicit def generate[T](value: T): Clue[T] =
  macro MacroCompatScala2.clueImpl

Which scalafmt then fails to parse:

[error] /home/andrew/grabbed/munit/munit/shared/src/main/scala-3/munit/internal/MacroCompat.scala:26: error: [dialect scala3] illegal start of statement
[error]       macro MacroCompatScala2.clueImpl
[error]       ^: /home/andrew/grabbed/munit/munit/shared/src/main/scala-3/munit/internal/MacroCompat.scala
[error] /home/andrew/grabbed/munit/munit/shared/src/main/scala-3/munit/internal/MacroCompat.scala:26: error: [dialect scala3] illegal start of statement

[armanbilge]

Maybe just disable scalafmt on that line?

[valencik]

Opened an issue upstream for now scalameta/scalameta#2727