Bump aiohttp from 3.5.3 to 3.9.4

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.5.3 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@v3.5.3...v3.9.4)

---
updated-dependencies:
- dependency-name: aiohttp
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 aiohttp-jinja2==1.1.0
 aiohttp-session==2.7.0
-aiohttp==3.5.3
+aiohttp==3.9.4
 aiopg==0.15.0
 aioredis==1.2.0
 async-timeout==3.0.1      # via aiohttp, aioredis