build(deps-dev): bump aiohttp in /tests/integration_tests

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.8.1 to 3.9.4.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.8.1...v3.9.4)

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

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