Go back to 1.1.2 for testing

For some reason, the coursier-1.1.0-M8 jars have misteriously disappeared from
Maven Central: https://repo1.maven.org/maven2/io/get-coursier/coursier_2.12/1.1.0-M8/

Unfortunately, this error happens when resolving bloop-launcher 1.2.0...
so we keep it as it was before, we upgrade to 1.1.0-M9 in 1.2.1 and then
we will upgrade the version of our tests. I confirm that all tests pass
locally except the one caused by the spurious coursier error.

launcher/src/test/scala/bloop/launcher/LauncherSpec.scala

@@ -21,7 +21,7 @@ import scala.util.control.NonFatal
 class LauncherSpec extends AbstractLauncherSpec {
   // Update the bsp version whenever we change the bloop version
   private final val bspVersion = "2.0.0-M1"
-  private final val bloopVersion = "1.2.0"
+  private final val bloopVersion = "1.1.2"
   private final val bloopServerPort = 9012
   private final val bloopDependency = s"ch.epfl.scala:bloop-frontend_2.12:${bloopVersion}"
   private final val shellWithPython = new Shell(true, true)