Bump aiohttp from 3.11.9 to 3.11.13

---
updated-dependencies:
- dependency-name: aiohttp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/backend/requirements.txt

@@ -2,7 +2,7 @@
 #    uv pip compile pyproject.toml -o requirements.txt --python-version 3.9
 aiohappyeyeballs==2.4.4
     # via aiohttp
-aiohttp==3.11.9
+aiohttp==3.11.13
     # via fastapi-app (pyproject.toml)
 aiosignal==1.3.1
     # via aiohttp