Bump aiohttp from 3.5.4 to 3.7.4 in /common/smoketest (#19330)

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.5.4 to 3.7.4.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.5.4...v3.7.4)

---
updated-dependencies:
- dependency-name: aiohttp
  dependency-type: direct:production
...

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

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

common/smoketest/requirements_async.txt

@@ -1 +1 @@
-aiohttp==3.5.4
+aiohttp==3.7.4