Bump aiohttp from 3.9.3 to 3.9.4 in /libraries/botbuilder-adapters-slack (#2097)

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.9.3 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](https://github.com/aio-libs/aiohttp/compare/v3.9.3...v3.9.4)

---
updated-dependencies:
- dependency-name: aiohttp
  dependency-type: direct:production
...

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libraries/botbuilder-adapters-slack/requirements.txt

@@ -1,4 +1,4 @@
-aiohttp==3.9.3
+aiohttp==3.9.4
 pyslack
 botbuilder-core==4.16.0
 slackclient