Bump aiohttp from 3.6.2 to 3.7.4.post0

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.6.2 to 3.7.4.post0.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.6.2...v3.7.4.post0)

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

requirements.txt

@@ -1,7 +1,7 @@
 fastapi[all]==0.60.1
 uvicorn==0.11.7
 aioredis==1.3.1
-aiohttp==3.6.2
+aiohttp==3.7.4.post0
 prometheus_client==0.8.0
 pytest==6.0.1
 tortoise-orm==0.16.14