Bump aiohttp from 3.8 to 3.8.1 (#639)

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.8 to 3.8.1.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/v3.8.1/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.8.0...v3.8.1)

---
updated-dependencies:
- dependency-name: aiohttp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

requirements-dev.txt

@@ -1,5 +1,5 @@
 -e .
-aiohttp==3.8
+aiohttp==3.8.1
 aiomcache==0.6.0
 aioredis==2.0.0
 attrs==21.2.0