feat(deps): bump Rspack v1.2.1 (#4416)

Author: chenjiahan

Diff for: packages/core/package.json

@@ -51,7 +51,7 @@
     "prebundle": "prebundle"
   },
   "dependencies": {
-    "@rspack/core": "1.2.0",
+    "@rspack/core": "1.2.1",
     "@rspack/lite-tapable": "~1.0.1",
     "@swc/helpers": "^0.5.15",
     "core-js": "~3.40.0"