chore: update rspack dependencies to beta.6 versions

Author: chenjiahan

package.json

@@ -15,9 +15,9 @@
     "@rsbuild/core": "2.0.0-beta.8",
     "@rsbuild/plugin-react": "^1.4.5",
     "@rsdoctor/rspack-plugin": "^1.5.3",
-    "@rspack/cli": "2.0.0-beta.5",
-    "@rspack/core": "2.0.0-beta.5",
-    "@rspack/dev-server": "^1.2.1",
+    "@rspack/cli": "2.0.0-beta.6",
+    "@rspack/core": "2.0.0-beta.6",
+    "@rspack/dev-server": "2.0.0-beta.6",
     "@rspack/plugin-react-refresh": "^1.6.1",
     "@swc/core": "^1.15.18",
     "@types/fs-extra": "^11.0.4",