Bump websockets from 8.1 to 9.1 in /shipment_redis

[dependabot]

Bumps websockets from 8.1 to 9.1.

Changelog

Sourced from websockets's changelog.

9.1 ...

May 27, 2021

.. note::

**Version 9.1 fixes a security issue introduced in version 8.0.**
Version 8.0 was vulnerable to timing attacks on HTTP Basic Auth passwords.

9.0.2 .....

May 15, 2021

• Restored compatibility of python -m websockets with Python < 3.9.

• Restored compatibility with mypy.

9.0.1 .....

May 2, 2021

• Fixed issues with the packaging of the 9.0 release.

9.0 ...

May 1, 2021

.. note::

**Version 9.0 moves or deprecates several APIs.**
Aliases provide backwards compatibility for all previously public APIs.


:class:~datastructures.Headers and
:exc:~datastructures.MultipleValuesError were moved from
websockets.http to :mod:websockets.datastructures. If you're using
them, you should adjust the import path.


The client, server, protocol, and auth modules were
moved from the websockets package to websockets.legacy
sub-package, as part of an upcoming refactoring. Despite the name,
they're still fully supported. The refactoring should be a transparent
upgrade for most uses when it's available. The legacy implementation
will be preserved according to the backwards-compatibility policy_.

... (truncated)

Commits

• d0f3288 Bump version number.
• 547a26b Use constant-time comparison for passwords.
• a14226a Bump version number.
• 8900c13 Add mypy to dictionary.
• 0713dbf Add test coverage.
• b99c4fe Restore real imports for compatibility with mypy.
• e44e085 Use relative imports everywhere, for consistency.
• 70fadbf Restore compatibility with Python < 3.9.
• 217ac2d Fix broken link.
• fc176f4 Bump version number.
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language

You can disable automated security fix PRs for this repo from the Security Alerts page.