Misleading/confusing error when workflow has out-of-date Scala

[armanbilge]

sbt-typelevel/.github/workflows/ci.yml

Lines 69 to 70 in 42eec29

	- name: Check that workflows are up to date
	run: sbt 'project ${{ matrix.project }}' '++${{ matrix.scala }}' 'project /' githubWorkflowCheck

Suppose you just bumped to Scala 3.1.3, and you forgot to re-generate the workflow. Because it attempts to set the Scala version before running the check, you can get into trouble like this:

[error] Switch failed: no subprojects list "3.1.2" (or compatible version) in crossScalaVersions setting.
[error] If you want to force it regardless, call ++ 3.1.2!