Bump webpack-cli from 5.1.1 to 5.1.4 in /samples/browser/webext

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 5.1.1 to 5.1.4.
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-cli/compare/webpack-cli@5.1.1...webpack-cli@5.1.4)

---
updated-dependencies:
- dependency-name: webpack-cli
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

samples/browser/webext/package.json

@@ -25,7 +25,7 @@
     "typescript": "^5.2.2",
     "web-ext-types": "^3.2.1",
     "webpack": "^5.88.2",
-    "webpack-cli": "^5.1.1",
+    "webpack-cli": "^5.1.4",
     "ts-node": "^10.8.0",
     "strip-ansi": "^7.1.0"
   }