stabilize cache ignore integration test

packages/dev-server/test/cache-ignore-config.test.ts

@@ -57,4 +57,4 @@ test("per-process dev caches are excluded from root and example project tools",
   } finally {
     for (const cache of caches) rmSync(cache, { recursive: true, force: true });
   }
-});
+}, 15_000);