Bump websockets from 8.1 to 9.1 (#6)

Bumps [websockets](https://github.com/aaugustin/websockets) from 8.1 to 9.1.
- [Release notes](https://github.com/aaugustin/websockets/releases)
- [Changelog](https://github.com/aaugustin/websockets/blob/9.1/docs/changelog.rst)
- [Commits](https://github.com/aaugustin/websockets/compare/8.1...9.1

)

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

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

requirements.txt

@@ -15,5 +15,5 @@ sqlparse==0.4.0
 twitchio==2.0.6
 typing-extensions==3.7.4.3
 urllib3==1.26.5
-websockets==8.1
+websockets==9.1
 yarl==1.6.3