Update celery-redbeat requirement from <2.2,>=2.1 to >=2.1,<2.4 in /backend

[dependabot]

Updates the requirements on celery-redbeat to permit the latest version.

Changelog

Sourced from celery-redbeat's changelog.

2.3.3 (2025-07-02)

• add Python 3.12 support, thanks @​AnkiHubSoftware
• bugfix, update RedBeatSchedulerEntry definitions for improved type safety and correctness, thanks @​sotosapp
• bugfix, Redbeat no longer updating tasks definitions on Redis #289, thanks @​semoac
• ci, fix testpypi publish by checking out source before version update
• test, pin fakeredis<2.27.0 for Python 3.8 support

2.3.0 (2025-02-23)

• bugfix, allow disabling of lock with redbeat_lock_key = None, thanks @​jscaria, @​molog, @​bertosantamaria
• bugfix, track changes to primary in Sentinel, thanks @​Niccolum
• bugfix, static entries honour last_run_at, thanks @​kchamz
• doc updates, thanks @​miketheman, @​cikay

2.2.0 (2023-12-22)

• add ssl support for redis with sentinel, thanks @​cyberjunk
• add RedisCluster Support, thanks @​kkinder
• bugfixes

2.1.1 (2023-06-11)

• fix compatability with Celery 5.3.0, thanks @​jkseppan

2.1.0 (2023-05-17)

• BREAKING, drop for support for EOL Python < 3.8
• log message cleanup, thanks @​joekohlsdorf
• ensure lock is owned before releasing, fixing #223, thanks @​michaelbukachi
• fix #238, #208, failure to aquire lock on startup leads to multiple task executions, thanks @​Junzki, @​nicklyra, @​nigel-gott
• Add options support for RedBeatSchedulerEntry, thanks @​anton-petrov

2.0.0 (2020-10-25)

• BREAKING CHANGES, test with your stack before deploying
  • Drop support for celery<4.2
  • Drop support for pyredis<3
  • Drop Python 2.7 and 3.5 support, update to 3.6+ syntax, thanks @​kleschenko
• Support timezones other than UTC thanks @​luoxiaohei, @​sempr and @​noamkush
• Many config handling consistentcy updates
• Use black linter and drop circle CI in favor of GitHub Actions

1.0.0 (2020-05-16)

• version bump of 0.13.0
• add warning for non-UTC timezones

0.13.0 (2019-03-08)

... (truncated)

Commits

• 2b85c88 prepare for release of 2.3.3
• 3d107dd update for release
• 30e812d makefile: add version target using grep for warning-free version check
• 1242fde update changelog for release
• f35e31c ci: fetch full git history for pbr versioning
• acf8261 build: switch to pbr for dynamic versioning and simplify workflow
• a317b5f bump version for release
• 5e185f6 ci: use .dev0.<githash> for testpypi version (PEP 440/PyPI compliant)
• f384d75 ci: ensure PEP 440 compliant version for testpypi with git hash
• bfc520b test: pin fakeredis<2.27.0 for Python 3.8 support (see comment)
• Additional commits viewable in compare view

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