Bump aiohttp from 3.8.1 to 3.9.4

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: direct:production
...

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

requirements.txt

@@ -1,5 +1,5 @@
 absl-py==1.0.0
-aiohttp==3.8.1
+aiohttp==3.9.4
 aiohttp-retry==2.4.6
 aiosignal==1.2.0
 alabaster @ file:///home/ktietz/src/ci/alabaster_1611921544520/work