build(deps): Bump redis from 3.2.1 to 3.3.8 in /backend

[dependabot-preview]

Bumps redis from 3.2.1 to 3.3.8.

Changelog

Sourced from redis's changelog.

• 3.3.8
  • Fixed MONITOR parsing to properly parse IPv6 client addresses, unix
    socket connections and commands issued from Lua. Thanks @​kukey. #1201
• 3.3.7
  • Fixed a regression introduced in 3.3.0 where socket.error exceptions
    (or subclasses) could potentially be raised instead of
    redis.exceptions.ConnectionError. #1202
• 3.3.6
  • Fixed a regression in 3.3.5 that caused PubSub.get_message() to raise
    a socket.timeout exception when passing a timeout value. #1200
• 3.3.5
  • Fix an issue where socket.timeout errors could be handled by the wrong
    exception handler in Python 2.7.
• 3.3.4
  • More specifically identify nonblocking read errors for both SSL and
    non-SSL connections. 3.3.1, 3.3.2 and 3.3.3 on Python 2.7 could
    potentially mask a ConnectionError. #1197
• 3.3.3
  • The SSL module in Python < 2.7.9 handles non-blocking sockets
    differently than 2.7.9+. This patch accommodates older versions. #1197
• 3.3.2
  • Further fixed a regression introduced in 3.3.0 involving SSL and
    non-blocking sockets. #1197
• 3.3.1
  • Fixed a regression introduced in 3.3.0 involving SSL and non-blocking
    sockets. #1197
• 3.3.0
  • Resolve a race condition with the PubSubWorkerThread. #1150
  • Cleanup socket read error messages. Thanks Vic Yu. #1159
  • Cleanup the Connection's selector correctly. Thanks Bruce Merry. #1153
  • Added a Monitor object to make working with MONITOR output easy.
    Thanks Roey Prat #1033
  • Internal cleanup: Removed the legacy Token class which was necessary
    with older version of Python that are no longer supported. #1066
  • Response callbacks are now case insensitive. This allows users that
    call Redis.execute_command() directly to pass lower-case command
    names and still get reasonable responses. #1168
  • Added support for hiredis-py 1.0.0 encoding error support. This should
    make the PythonParser and the HiredisParser behave identically
    when encountering encoding errors. Thanks Brian Candler. #1161/#1162
  • All authentication errors now properly raise AuthenticationError.
    AuthenticationError is now a subclass of ConnectionError, which will
    cause the connection to be disconnected and cleaned up appropriately.
    #923
  • Add READONLY and READWRITE commands. Thanks @​theodesp. #1114
  • Remove selectors in favor of nonblocking sockets. Selectors had
    issues in some environments including eventlet and gevent. This should
    resolve those issues with no other side effects.
  • Fixed an issue with XCLAIM and previously claimed but not removed
    messages. Thanks @​thomdask. #1192/#1191

... (truncated)

Commits

• See full diff 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
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.