Bump express and @quasar/app-webpack in /app

Bumps [express](https://github.com/expressjs/express) to 4.19.2 and updates ancestor dependency [@quasar/app-webpack](https://github.com/quasarframework/quasar). These dependencies need to be updated together.


Updates `express` from 4.18.2 to 4.19.2
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.18.2...4.19.2)

Updates `@quasar/app-webpack` from 3.6.2 to 3.12.6
- [Release notes](https://github.com/quasarframework/quasar/releases)
- [Commits](https://github.com/quasarframework/quasar/compare/@quasar/app-webpack-v3.6.2...@quasar/app-webpack-v3.12.6)

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

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