Update cats-core to 2.4.1

[scala-steward]

Updates org.typelevel:cats-core from 2.3.1 to 2.4.1.
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labels: library-update, semver-minor

[larsrh]

Probably caused by typelevel/cats#3677.

[joroKr21]

type LOption[A] = List[Option[A]] 🤔

[joroKr21]

I think this is creating a cycle:

implicit def mkEmptyKConst[T](implicit T: Empty[T]): MkEmptyK[Const[T]#λ] =
    new MkEmptyK[Const[T]#λ] {
      def empty[A] = T.empty
    }
    
implicit def fromEmptyK[F[_], T](implicit ekf: EmptyK[F]): Empty[F[T]] = ekf.synthesize[T]

[joroKr21]

superseded by #303