Investigate ambiguous extension methods when trying to call map on OptionT

[mpilquist]

spotted-leopards/src/test/scala/leopards/OptionTTest.scala

Lines 12 to 27 in 720a6e2

	@Test def map(): Unit = {
	val x = OptionT.fromOption[F = List](Some(42))
	// https://github.com/typelevel/spotted-leopards/issues/1
	// x.map(_ + 1)
	// // Fails to compile with:
	// // [error] -- [E008] Member Not Found Error: spotted-leopards/src/test/scala/leopards/OptionTTest.scala:9:6
	// // [error] 9 | x.map(_ + 1)
	// // [error] | ^^^^^
	// // [error] |value map is not a member of leopards.OptionT.OptionT[List, Int] - did you mean x.==?.
	// // [error] |An extension method was tried, but could not be fully constructed:
	// // [error] |
	// // [error] | leopards.OptionT$package.OptionT.FunctorInstance[([_$15] => Any)](
	// // [error] | /* ambiguous */implicitly[leopards.Functor[([_$15] => Any)]]
	// // [error] | ).map()
	// assertEquals(x.value, List(Some(43)))
	}

[mpilquist]

With 3.0.0-RC3:

[error] 14 |    x.map(_ + 1)
[error]    |    ^^^^^
[error]    |value map is not a member of leopards.OptionT[List, Int].
[error]    |An extension method was tried, but could not be fully constructed:
[error]    |
[error]    |    leopards.OptionT.given_Functor_OptionT[F](
[error]    |      /* ambiguous: both object given_Monad_List_Traverse_List in package leopards and object given_Monad_Option_Traverse_Option in package leopards match type leopards.Functor[F] */
[error]    |        summon[leopards.Functor[F]]
[error]    |    ).map()

[smarter]

Looks like this was the same issue as #2 and is also fixed in scalaVersion := "3.1.1-RC1-bin-20210916-dd6da26-NIGHTLY"