Bump websockets from 13.0.1 to 13.1

Bumps websockets from 13.0.1 to 13.1.

Release notes

Sourced from websockets's releases.

13.1

See https://websockets.readthedocs.io/en/stable/project/changelog.html for details.

Commits

• 4d229bf Release version 13.1.
• 0afccc9 Clarify comment.
• 3640923 Wait until state is CLOSED to acces close_exc.
• 20739e0 Improve exception handling during handshake.
• 206624a Standard spelling on "an HTTP".
• 98f236f Run handler only when opening handshake succeeds.
• d19ed26 Run spellcheck.
• 070ff1a Add dedicated ConcurrencyError exception.
• f9cea9c Improve isolation of tests of sync implementation.
• 14d9d40 Fix typo in convenience imports.
• Additional commits viewable in compare view