build(deps): bump aiohttp in /experiment-tracker/experiment-proxy

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] <support@github.com>

experiment-tracker/experiment-proxy/requirements.txt

@@ -2,7 +2,7 @@ fastapi==0.103.1
 pydantic==2.3.0
 pydantic-settings==2.0.3
 python-multipart==0.0.6
-aiohttp==3.8.5
+aiohttp==3.9.0
 uvicorn==0.23.2
 
 git+https://github.com/xai-demonstrator/xai-demonstrator.git@023887732c1fc325acaf4a2b0b4c4a1a1664e1ce#egg=xaidemo&subdirectory=common/backend-utils