chore: bump webpack from 5.39.1 to 5.40.0 in /packages/backend (#625)

Bumps [webpack](https://github.com/webpack/webpack) from 5.39.1 to 5.40.0.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v5.39.1...v5.40.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

packages/backend/package.json

@@ -214,7 +214,7 @@
     "ts-loader": "^9.2.3",
     "ts-node": "^9.1.1",
     "vsce": "^1.93.0",
-    "webpack": "5.39.1",
+    "webpack": "5.40.0",
     "webpack-cli": "4.7.2"
   },
   "engines": {