Update aiohttp requirement from ==3.8.* to ==3.9.* (#3875)

Updates the requirements on [aiohttp](https://github.com/aio-libs/aiohttp) to permit the latest version.
- [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/v3.8.0a0...v3.9.3)

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

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pyproject.toml

@@ -110,7 +110,7 @@ dependencies = [
 [project.optional-dependencies]
 memcached = ["pylibmc"]
 dev = [
-  "aiohttp==3.8.*",
+  "aiohttp==3.9.*",
   "coverage",
   "coveralls",
   "fakeredis==2.18.*",