Bump aiohttp from 3.8.5 to 3.8.6 (#995)

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.8.5 to 3.8.6.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.8.5...v3.8.6)

---
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>

requirements.txt

@@ -1,6 +1,6 @@
 aiodns>=1.1  # aiodns speeds up DNS resolving
 aiofile>=2.0.0
-aiohttp==3.8.5
+aiohttp==3.8.6
 cchardet
 cython
 order_book==0.6.0

setup.py

@@ -77,7 +77,7 @@ def run_tests(self):
         "requests>=2.18.4",
         "websockets>=10.0",
         "pyyaml",
-        "aiohttp==3.8.5",
+        "aiohttp==3.8.6",
         "aiofile>=2.0.0",
         "yapic.json>=1.6.3",
         'uvloop ; platform_system!="Windows"',