test: fix missing runtime deps

Author: chenjiahan

example/package.json

@@ -8,8 +8,8 @@
     "preview": "rspack preview"
   },
   "devDependencies": {
-    "@rspack/cli": "2.0.0-beta.5",
-    "@rspack/core": "2.0.0-beta.5",
+    "@rspack/cli": "2.0.0-beta.6",
+    "@rspack/core": "2.0.0-beta.6",
     "@rspack/dev-server": "workspace:*"
   }
 }

package.json

@@ -61,7 +61,7 @@
     "@biomejs/biome": "^1.9.4",
     "@hono/node-server": "^1.19.11",
     "@rslib/core": "^0.20.0",
-    "@rspack/core": "2.0.0-beta.5",
+    "@rspack/core": "2.0.0-beta.6",
     "@rspack/plugin-react-refresh": "1.6.1",
     "@rstest/core": "^0.9.2",
     "@types/mime-types": "3.0.1",