fix: use yarn workspace run instead of the default lerna for vuetify

Somehow the lerna command swallows the error messages but
`yarn workspace` won't

tests/vuetify.ts

@@ -6,7 +6,7 @@ export async function test(options: RunOptions) {
 		...options,
 		repo: 'vuetifyjs/vuetify',
 		branch: 'master',
-		build: 'build vuetify',
+		build: 'yarn workspace vuetify run build',
 		// there's also an e2e test script in vuetify,
 		// but it seems flaky, so I skipped it for now
 		test: ['yarn lerna run test:coverage -- -- -i'],