[deps] Update channels-redis requirement from ~=4.2.0 to ~=4.3.0

[dependabot]

Updates the requirements on channels-redis to permit the latest version.

Changelog

Sourced from channels-redis's changelog.

4.3.0 (2025-07-22)

• Added support for Python 3.13.

• Dropped support for EOL Python 3.8.

• Updated Channels dependency to at least v4.2.2.

• Updated asgiref dependency to at least v3.9.1.

• Fixed compatibility with latest versions of pytest-asyncio.

• Renamed internal methods in core channel layer for compatibility with Channels v4.2.1+

• Dropped testing against legacy Channels v3 branch.

• Updated testing against latest redis-py versions.

4.2.1 (2024-11-15)

• Added a way to register and use custom serializer formats. See README.rst.

4.2.0 (2024-01-12)

• Dropped support for end-of-life Python 3.7.

• Added support for Python 3.11 and 3.12.

• Upped the minimum version of redis-py to 4.6.

• Added CI testing against redis-py versions 4.6, 5, and the development branch.

• Added CI testing against Channels versions 3, 4, and the development branch.

4.1.0 (2023-03-28)

• Adjusted the way Redis connections are handled:

  • Connection handling is now shared between the two, core and pub-sub, layers.

  • Both layers now ensure that connections are closed when an event loop shuts down.

    In particular, redis-py 4.x requires that connections are manually closed. In 4.0 that wasn't done by the core layer, which led to warnings for people

... (truncated)

Commits

• 8498605 Updated version and changelog for v4.3.0.
• 3e03c45 Update Channels and asgiref dependencies to latest versions.
• 3f42840 Update redis-py testing matrix
• 4f35ef5 Adjust Channels testing matrix.
• 26f3f8f Renamed internal methods in core channel layer.
• b359bf7 Stop using old event_loop fixture.
• f439527 Dropped Python 3.8 from test matrix.
• 662b90d Added support for Python 3.13 (#404)
• ab8fd13 Fixed README syntax errors.
• 20fe75d Set date for 4.2.1 release.
• Additional commits viewable in compare view

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[nemesifier]

@dependabot recreate

[nemesifier]

Seems to break the build.