Clean up dead code

Author: liufengyun

project/Build.scala

@@ -239,7 +239,6 @@ object Build {
 
     libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % Test,
     libraryDependencies += "io.get-coursier" % "coursier_2.13" % "2.0.0-RC5-6" % Test,
-    // libraryDependencies += "io.get-coursier" % "coursier-cache_2.13" % "2.0.0-RC5-6" % Test,
 
     // If someone puts a source file at the root (e.g., for manual testing),
     // don't pick it up as part of any project.