chore(backend): bump copy-webpack-plugin in /services/backend

Bumps [copy-webpack-plugin](https://github.com/webpack/copy-webpack-plugin) from 13.0.1 to 14.0.0.
- [Release notes](https://github.com/webpack/copy-webpack-plugin/releases)
- [Changelog](https://github.com/webpack/copy-webpack-plugin/blob/main/CHANGELOG.md)
- [Commits](webpack/copy-webpack-plugin@v13.0.1...v14.0.0)

---
updated-dependencies:
- dependency-name: copy-webpack-plugin
  dependency-version: 14.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

services/backend/package.json

@@ -67,7 +67,7 @@
     "@typescript-eslint/parser": "^8.56.1",
     "@vitest/coverage-v8": "^3.2.4",
     "autoprefixer": "^10.4.24",
-    "copy-webpack-plugin": "^13.0.1",
+    "copy-webpack-plugin": "^14.0.0",
     "drizzle-kit": "^0.31.9",
     "eslint": "^10.0.0",
     "fs-extra": "^11.3.3",