Bump websockets from 6.0 to 8.1

Bumps [websockets](https://github.com/aaugustin/websockets) from 6.0 to 8.1.
- [Release notes](https://github.com/aaugustin/websockets/releases)
- [Changelog](https://github.com/aaugustin/websockets/blob/master/docs/changelog.rst)
- [Commits](python-websockets/websockets@6.0...8.1)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -14,5 +14,5 @@ python-dotenv==0.10.5
 requests==2.22.0
 soupsieve==1.9.5
 urllib3==1.25.8
-websockets==6.0
+websockets==8.1
 yarl==1.4.2