⬆️ Bump aiohttp from 3.8.1 to 3.8.4

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.8.1 to 3.8.4.
- [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...v3.8.4)