fix(material/schematics): update test setup function name in template migration test

Author: amysorto

src/material/schematics/ng-generate/mdc-migration/rules/template-migration.spec.ts

@@ -1,14 +1,18 @@
 import {createTestApp, patchDevkitTreeToExposeTypeScript} from '@angular/cdk/schematics/testing';
 import {SchematicTestRunner, UnitTestTree} from '@angular-devkit/schematics/testing';
-import {createNewTestRunner, migrateComponent, TEMPLATE_FILE} from './components/test-setup-helper';
+import {
+  createNewTestRunner,
+  migrateComponents,
+  TEMPLATE_FILE,
+} from './components/test-setup-helper';
 
 describe('template migrations', () => {
   let runner: SchematicTestRunner;
   let cliAppTree: UnitTestTree;
 
   async function runMigrationTest(oldFileContent: string, newFileContent: string) {
     cliAppTree.overwrite(TEMPLATE_FILE, oldFileContent);
-    const tree = await migrateComponent('card', runner, cliAppTree);
+    const tree = await migrateComponents(['card'], runner, cliAppTree);
     expect(tree.readContent(TEMPLATE_FILE)).toBe(newFileContent);
   }