Fix binary compatibility check when bumping scala version

[bjaglin]

It seems that this is no longer enough

scalafix/project/ScalafixBuild.scala

Lines 226 to 245 in d68d223

	mimaPreviousArtifacts := {
	val currentScalaFullV = scalaVersion.value
	val previousScalaFullV =
	PreviousScalaVersion.getOrElse(currentScalaFullV, currentScalaFullV)
	val previousScalaVCrossName = CrossVersion(
	crossVersion.value,
	previousScalaFullV,
	scalaBinaryVersion.value
	).getOrElse(identity[String] _)(moduleName.value)
	Set(
	organizationName.value % previousScalaVCrossName % stableVersion.value
	)
	},
	mimaDependencyResolution := {
	// effectively reverts https://github.com/lightbend/mima/pull/508 since the
	// Coursier resolution ignores/overrides the explicit scala full version set
	// in mimaPreviousArtifacts
	val ivy = sbt.Keys.ivySbt.value
	IvyDependencyResolution(ivy.configuration)
	},

https://github.com/scalacenter/scalafix/actions/runs/3059849584/jobs/4937701943#step:5:649

As a result, this is needed (and forgotten most of the times):

• d43aed3#diff-cf70a614681abb9e33115a49e0b4a52865bdfcdb24c4c0df4af6546d92f88f5fR198
• d68d223

[bjaglin]

The regression was introduced by #1565