build(deps): bump aiohttp from 3.8.5 to 3.8.6 in /images/hub

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: indirect
...

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

images/hub/requirements.txt

@@ -4,7 +4,7 @@
 #
 #    Use the "Run workflow" button at https://github.com/jupyterhub/zero-to-jupyterhub-k8s/actions/workflows/watch-dependencies.yaml
 #
-aiohttp==3.8.5
+aiohttp==3.8.6
     # via kubernetes-asyncio
 aiosignal==1.3.1
     # via aiohttp