Bump aiohttp from 3.7.4.post0 to 3.8.1

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.7.4.post0 to 3.8.1.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.7.4.post0...v3.8.1)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
-aiohttp==3.7.4.post0
+aiohttp==3.8.1
 aiohttp-cors==0.7.0
 asyncpg==0.25.0
 jsonschema==3.2.0; python_version < '3.7'

setup.py

@@ -38,7 +38,7 @@
     ],
     install_requires=[
         "asyncpg==0.25.0",
-        "aiohttp==3.7.4.post0",
+        "aiohttp==3.8.1",
         "Authlib==0.15.5",
         "aiohttp-cors==0.7.0",
         "jsonschema==3.2.0; python_version < '3.7'",