Bump aiohttp from 3.7.2 to 3.7.3 (#363)

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.7.2 to 3.7.3.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](https://github.com/aio-libs/aiohttp/compare/v3.7.2...v3.7.3)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

requirements-dev.txt

@@ -13,6 +13,6 @@ aioredis==1.3.1
 hiredis==1.1.0
 passlib==1.7.4
 cryptography==3.3.1
-aiohttp==3.7.2
+aiohttp==3.7.3
 pytest-aiohttp==0.3.0
 pyjwt==1.7.1