Bump @rails/webpacker from 5.0.0 to 5.2.1

Bumps [@rails/webpacker](https://github.com/rails/webpacker) from 5.0.0 to 5.2.1.
- [Release notes](https://github.com/rails/webpacker/releases)
- [Changelog](https://github.com/rails/webpacker/blob/v5.2.1/CHANGELOG.md)
- [Commits](rails/webpacker@v5.0.0...v5.2.1)

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

Author: dependabot-preview[bot]

package.json

@@ -5,7 +5,7 @@
     "@rails/actioncable": "^6.0.3",
     "@rails/activestorage": "^6.0.3",
     "@rails/ujs": "^6.0.3",
-    "@rails/webpacker": "^5.0.0",
+    "@rails/webpacker": "^5.2.1",
     "turbolinks": "^5.2.0"
   },
   "version": "0.1.0",