build(deps-dev): bump aiohttp in /demos/moderator_bot

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.8.6 to 3.9.2.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.8.6...v3.9.2)

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

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

demos/moderator_bot/requirements-dev.txt

@@ -1,5 +1,5 @@
 -i https://pypi.org/simple/
-aiohttp==3.8.6
+aiohttp==3.9.2
 aioslacker==0.0.11
 async-timeout==4.0.3
 atomicwrites==1.4.1