Bump aiohttp from 3.7.3 to 3.7.4 (#220)

* Bump aiohttp from 3.7.3 to 3.7.4

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.7.3 to 3.7.4.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.7.3...v3.7.4)

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

* Bump version to 3.7.4.post0

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: epenet <6771947+epenet@users.noreply.github.com>