Bump aiohttp from 3.8.5 to 3.9.0 in /signaling-server (#133)

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.8.5 to 3.9.0.
- [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...v3.9.0)

---
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>
Co-authored-by: mamaheux <[email protected]>

signaling-server/requirements.txt

@@ -1,2 +1,2 @@
-aiohttp==3.8.5
+aiohttp==3.9.0
 aiohttp_index==0.1