[Playground dependencies]: Bump webpack

Bumps the dependencies-dev group in /playground with 1 update: [webpack](https://github.com/webpack/webpack).


Updates `webpack` from 5.99.3 to 5.99.4
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v5.99.3...v5.99.4)

---
updated-dependencies:
- dependency-name: webpack
  dependency-version: 5.99.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dependencies-dev
...

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

Author: dependabot[bot]

playground/package.json

@@ -58,7 +58,7 @@
     "typed-scss-modules": "^8.1.1",
     "typescript": "^5.8.3",
     "typescript-eslint": "^8.29.1",
-    "webpack": "^5.99.3",
+    "webpack": "^5.99.4",
     "webpack-cli": "^6.0.1",
     "webpack-dev-server": "^5.2.1"
   },