Bump webpack-dev-middleware and @quasar/app in /website

Bumps [webpack-dev-middleware](https://github.com/webpack/webpack-dev-middleware) to 5.3.4 and updates ancestor dependency [@quasar/app](https://github.com/quasarframework/quasar). These dependencies need to be updated together.


Updates `webpack-dev-middleware` from 3.7.0 to 5.3.4
- [Release notes](https://github.com/webpack/webpack-dev-middleware/releases)
- [Changelog](https://github.com/webpack/webpack-dev-middleware/blob/v5.3.4/CHANGELOG.md)
- [Commits](webpack/webpack-dev-middleware@v3.7.0...v5.3.4)

Updates `@quasar/app` from 1.0.0-rc.7 to 3.3.3
- [Release notes](https://github.com/quasarframework/quasar/releases)
- [Commits](https://github.com/quasarframework/quasar/compare/@quasar/app-v1.0.0-rc.7...@quasar/app-v3.3.3)

---
updated-dependencies:
- dependency-name: webpack-dev-middleware
  dependency-type: indirect
- dependency-name: "@quasar/app"
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>