chore(deps): update uvicorn requirement from <1.0.0,>=0.29.0 to >=0.51.0,<1.0.0 in /backend

[dependabot]

Updates the requirements on uvicorn to permit the latest version.

Release notes

Sourced from uvicorn's releases.

Version 0.51.0

What's Changed

• Restart workers with overlap on SIGHUP for near-zero-downtime reloads by @​Kludex in Kludex/uvicorn#3025
• Remove colorama from the standard extra by @​Kludex in Kludex/uvicorn#3027

Full Changelog: Kludex/uvicorn@0.50.2...0.51.0

Changelog

Sourced from uvicorn's changelog.

0.51.0 (July 8, 2026)

Added

• Restart workers one at a time on SIGHUP, bringing each replacement up before retiring the old worker, so reloads no longer drop requests (#3025)

Removed

• Remove colorama from the standard extra (#3027)

0.50.2 (July 6, 2026)

Fixed

• Require websockets>=13.0, which the default websockets-sansio implementation needs (#3021)

0.50.1 (July 6, 2026)

Fixed

• Split comma-separated Sec-WebSocket-Protocol values in the websockets-sansio implementation (#3019)

0.50.0 (July 4, 2026)

If you use WebSockets, note that --ws auto now picks the websockets-sansio implementation. You shouldn't need it, but you can pin --ws websockets to get the deprecated legacy one back.

Changed

• Exit with the dedicated code 3 on any startup failure: app loading, socket bind and lifespan startup errors previously exited with a mix of 0, 1 and 3 (#3001)
• Stop the multiprocess supervisor when a worker exits with code 3 instead of restarting it forever (#3001)
• Default --ws auto to websockets-sansio when websockets is installed (#2985)
• Skip the eager app import in the parent process with --reload or --workers, fixing a memory regression introduced in 0.47.0 (#3012)
• Build a fresh asgi scope dict per request (#2977)
• Cache the asgi scope sub-dict per connection (#2976)
• Avoid copying single-frame WebSocket payloads in websockets-sansio (#2983)
• Memoize trusted host checks in ProxyHeadersMiddleware (#2970)
• Replace click.style with an internal ANSI style helper (#2981)

Deprecated

• Deprecate the legacy websockets implementation; use websockets-sansio or wsproto instead (#2985)

0.49.0 (June 3, 2026)

Changed

• Bump httptools minimum version to 0.8.0 (#2962)
• Consume duplicate forwarding headers in ProxyHeadersMiddleware (reverses the 0.48.0 behavior of ignoring them) (#2971)

0.48.0 (May 24, 2026)

... (truncated)

Commits

• e4d0b05 Version 0.51.0 (#3028)
• 944e43d Remove colorama from the standard extra (#3027)
• 2e78770 Restart workers with overlap on SIGHUP for near-zero-downtime reloads (#3025)
• a1b570c Version 0.50.2 (#3022)
• 83c7da7 Require websockets>=13.0 for the default sansio implementation (#3021)
• b4d0116 Version 0.50.1 (#3020)
• 2a9151d Split comma-separated Sec-WebSocket-Protocol values in the websockets-sansi...
• 1bf3ab4 Cover the excluded-directory branch in FileFilter with a direct test (#3014)
• 837b5f9 Deflake multiprocess, reload, and signal supervisor tests (#2975)
• 21d2c16 Version 0.50.0 (#3013)
• Additional commits viewable in compare view

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Summary by CodeRabbit

• Chores
  • Updated underlying application infrastructure to align with current runtime standards.
  • No user-facing features or behavior changes were introduced.

[dependabot]

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📥 Commits

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📒 Files selected for processing (1)

• backend/requirements.txt

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Walkthrough

The backend dependency constraint for uvicorn[standard] now requires version 0.51.0 or newer while remaining below 1.0.0.

Changes

Backend dependency update

Layer / File(s)	Summary
Update uvicorn minimum version backend/requirements.txt	Raises the minimum uvicorn[standard] version from 0.29.0 to 0.51.0 while preserving the <1.0.0 upper bound.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: ankittroy-21

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating the backend uvicorn dependency constraint.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch dependabot/pip/backend/uvicorn-gte-0.51.0-and-lt-1.0.0

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