Remove unused removeDependency from JavaSourceSetUpdater, clean up import

Author: steve-aom-elliott

rewrite-maven/src/main/java/org/openrewrite/maven/utilities/JavaSourceSetUpdater.java

@@ -115,14 +115,6 @@ public JavaSourceSet addDependency(JavaSourceSet sourceSet,
         return sourceSet;
     }
 
-    /**
-     * Update a JavaSourceSet to reflect a removed dependency.
-     */
-    public JavaSourceSet removeDependency(JavaSourceSet sourceSet,
-                                          ResolvedDependency dep) {
-        return sourceSet.removeTypesForGav(gavKey(dep));
-    }
-
     private List<JavaType.FullyQualified> downloadAndScanTypes(ResolvedDependency dep) {
         try {
             Path jarPath = downloader.downloadArtifact(dep);