Bump ra-data-json-server from 3.1.2 to 3.1.3 in /ui

Bumps [ra-data-json-server](https://github.com/marmelab/react-admin) from 3.1.2 to 3.1.3.
- [Release notes](https://github.com/marmelab/react-admin/releases)
- [Changelog](https://github.com/marmelab/react-admin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/marmelab/react-admin/compare/v3.1.2...v3.1.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

ui/package.json

@@ -8,7 +8,7 @@
     "@testing-library/user-event": "^8.0.3",
     "jwt-decode": "^2.2.0",
     "prop-types": "^15.7.2",
-    "ra-data-json-server": "^3.1.2",
+    "ra-data-json-server": "^3.1.3",
     "react": "^16.12.0",
     "react-admin": "^3.1.2",
     "react-dom": "^16.12.0",