chore(deps): update @rspack/dev-server to 1.2.1

- Updates @rspack/dev-server from 1.2.1 to 1.2.1
- Release notes:

Author: renovate[bot]

package-lock.json

@@ -49,7 +49,7 @@
     "@nx/js": "^22.4.2",
     "@rspack/core": "^1.0.0",
     "@rspack/cli": "^1.0.0",
-    "@rspack/dev-server": "^1.0.0",
+    "@rspack/dev-server": "^1.2.1",
     "@testing-library/dom": "^10.4.1",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^15.0.7",