Bump websockets from 7.0 to 9.1 in /updater

Bumps [websockets](https://github.com/aaugustin/websockets) from 7.0 to 9.1.
- [Release notes](https://github.com/aaugustin/websockets/releases)
- [Changelog](https://github.com/aaugustin/websockets/blob/9.1/docs/changelog.rst)
- [Commits](python-websockets/websockets@7.0...9.1)

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

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

Author: dependabot[bot]

updater/requirements.txt

@@ -30,6 +30,6 @@ toolz==0.10.0
 urllib3==1.25.8
 varint==1.0.2
 web3==5.0.0
-websockets==7.0
+websockets==9.1
 ed25519==1.5
 marshmallow==3.18.0