Bump aiohttp from 3.8.6 to 3.9.2 in /benchmarks/osb (#1431)

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.8.6 to 3.9.2.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.8.6...v3.9.2)

---
updated-dependencies:
- dependency-name: aiohttp
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

benchmarks/osb/requirements.txt

@@ -4,7 +4,7 @@
 #
 #    pip-compile
 #
-aiohttp==3.8.6
+aiohttp==3.9.2
     # via opensearch-py
 aiosignal==1.2.0
     # via aiohttp
@@ -20,8 +20,6 @@ certifi==2023.7.22
     # via
     #   opensearch-benchmark
     #   opensearch-py
-charset-normalizer==2.0.12
-    # via aiohttp
 frozenlist==1.3.0
     # via
     #   aiohttp