Bump aiohttp from 3.9.1 to 3.9.2 in /backend/app

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.9.1 to 3.9.2.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.9.1...v3.9.2)

---
updated-dependencies:
- dependency-name: aiohttp
  dependency-type: indirect
...

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