ci: pin nx version to fix build (#1143)

Author: Balastrong

package.json

@@ -51,7 +51,7 @@
     "eslint-plugin-react-hooks": "^5.1.0",
     "jsdom": "^25.0.1",
     "knip": "^5.39.2",
-    "nx": "^20.2.0",
+    "nx": "20.4.0",
     "premove": "^4.0.0",
     "prettier": "^3.4.2",
     "publint": "^0.2.12",