Update flower to 2.1.0

[pyup-bot]

This PR updates flower from 0.9.3 to 2.1.0.

Changelog

2.1.0

Features

- Added read-only mode for the UI and API by MrEarle [1468](https://github.com/mher/flower/issues/1468)
- Updated the UI with a responsive design
- Added persistent dark mode with light and system theme options
- Added a browser favicon by rolfws [1502](https://github.com/mher/flower/issues/1502)
- Improved task search with boolean operators and field filters
- Preserved task-table preferences across visits by fretman92 [1333](https://github.com/mher/flower/issues/1333)
- Added TLS support for Redis Sentinel by cyberjunk [1327](https://github.com/mher/flower/issues/1327)
- Added AMQPS support for RabbitMQ connections by borland667
- Updated and auto-provisioned the Grafana dashboard

Performance and reliability

- Moved blocking broker and control operations off the I/O loop
- Made Redis queue inspection asynchronous and pipelined
- Prevented duplicate worker inspections
- Fixed broker connection leaks [1490](https://github.com/mher/flower/issues/1490)
- Purged stale offline-worker Prometheus metrics [1128](https://github.com/mher/flower/issues/1128)
- Persisted dashboard counters across restarts [787](https://github.com/mher/flower/issues/787)
- Improved handling of missing custom configuration files

Bug fixes

- Fixed Redis SSL configurations [1177](https://github.com/mher/flower/issues/1177)
- Fixed percent-encoded IPv6 broker addresses [1220](https://github.com/mher/flower/issues/1220)
- Stopped exposing broker alternate URLs in worker statistics [1512](https://github.com/mher/flower/issues/1512)
- Fixed broker page rendering when queue inspection fails by alexei [1501](https://github.com/mher/flower/issues/1501)
- Fixed autoscaling response interpolation by funkyrailroad [1427](https://github.com/mher/flower/issues/1427)
- Improved GitHub OAuth errors when email access is unavailable by bysiber [1486](https://github.com/mher/flower/issues/1486)
- Prevented authentication failures while rendering error pages [1268](https://github.com/mher/flower/issues/1268), [#1499](https://github.com/mher/flower/issues/1499)
- Fixed task search for non-string values [1401](https://github.com/mher/flower/issues/1401)
- Fixed task state filters to require the state prefix by AleksaMCode [1516](https://github.com/mher/flower/issues/1516)
- Fixed worker names in timeout and rate-limit error responses by phanky1 [1506](https://github.com/mher/flower/issues/1506)
- Fixed startup banner output when using a dynamic port [1449](https://github.com/mher/flower/issues/1449)
- Fixed worker active-task totals when counts are null by M4RC0Sx [1511](https://github.com/mher/flower/issues/1511)
- Fixed undefined worker pool grow and shrink values by daydaychen [1324](https://github.com/mher/flower/issues/1324)

Documentation

- Documented custom authentication providers [1344](https://github.com/mher/flower/issues/1344)
- Fixed the GitLab authentication handler name by Saluev [1325](https://github.com/mher/flower/issues/1325)
- Fixed the persistent database CLI example by hatamiarash7 [1326](https://github.com/mher/flower/issues/1326)
- Fixed the Grafana example URL by NiclasvanEyk [1345](https://github.com/mher/flower/issues/1345)
- Fixed the nginx reverse-proxy example by titovanton
- Added the GitHub repository link to the documentation by PamelaM
- Fixed the documented database filename by WilliamDEdwards [1494](https://github.com/mher/flower/issues/1494)
- Fixed the documented max tasks default by masahiro331 [1415](https://github.com/mher/flower/issues/1415)
- Clarified task API options [1269](https://github.com/mher/flower/issues/1269)

Compatibility and packaging

- Added Python 3.13 and 3.14 support; Python 3.10+ is now required [1439](https://github.com/mher/flower/issues/1439)
- Added Python 3.12 support and package classification by foarsitter [1334](https://github.com/mher/flower/issues/1334)
- Removed obsolete Python versions from CI and tox by auvipy [1442](https://github.com/mher/flower/issues/1442)
- Added Celery 5.6 CI coverage
- Updated the tox compatibility matrix by auvipy [1451](https://github.com/mher/flower/issues/1451), [#1452](https://github.com/mher/flower/issues/1452)
- Raised the minimum Tornado version to 6.5.7 [1439](https://github.com/mher/flower/issues/1439)
- Upgraded OpenSSL in the Docker image by matheusnascgomes [1483](https://github.com/mher/flower/issues/1483)
- Added Dependabot management for GitHub Actions by cclauss [1383](https://github.com/mher/flower/issues/1383)
- Improved CI linting reliability by Nusnus [1445](https://github.com/mher/flower/issues/1445)
- Updated .gitignore to exclude local Python version files by Nusnus [1444](https://github.com/mher/flower/issues/1444)
- Ran unit tests before lint checks by auvipy [1447](https://github.com/mher/flower/issues/1447)
- Removed the obsolete Travis CI configuration by auvipy
- Enabled API access in the Docker Compose demo

**Full changelog:** [v2.0.1...v2.1.0](https://github.com/mher/flower/compare/v2.0.1...v2.1.0)

Links

• PyPI: https://pypi.org/project/flower
• Changelog: https://data.safetycli.com/changelogs/flower/
• Repo: https://github.com/mher/flower