Bump the pip group across 1 directory with 3 updates

Bumps the pip group with 3 updates in the /benchmark directory: [aiohttp](https://github.com/aio-libs/aiohttp), [starlette](https://github.com/encode/starlette) and [tornado](https://github.com/tornadoweb/tornado).


Updates `aiohttp` from 3.8.2 to 3.9.4
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.8.2...v3.9.4)

Updates `starlette` from 0.19.1 to 0.36.2
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](encode/starlette@0.19.1...0.36.2)

Updates `tornado` from 6.1 to 6.3.3
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.1.0...v6.3.3)

---
updated-dependencies:
- dependency-name: aiohttp
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: starlette
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: tornado
  dependency-type: direct:production
  dependency-group: pip
...

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

benchmark/requirements.txt

@@ -1,8 +1,8 @@
-aiohttp==3.8.2
+aiohttp==3.9.4
 # Blacksheep depends upon essentials_openapi which is pinned to pyyaml==5.4.1
 # and pyyaml>5.3.1 is broken for cython 3
 # See https://github.com/yaml/pyyaml/issues/724#issuecomment-1638587228
 # blacksheep==1.2.7
-starlette==0.19.1
-tornado==6.1
+starlette==0.36.2
+tornado==6.3.3
 uvicorn==0.16.0