fix(deps): update Celery to 5.6.0+ to fix task_id None error

[ANJAN672]

Updates Celery from ~=5.5 to >=5.6.0 to fix a bug where task_id becomes None during exception handling while executing a task chain within a chord.

This was reported in celery/celery#9774 and fixed in Celery 5.6.0.

Description

• Updated celery~=5.5 → celery>=5.6.0 in pyproject.toml
• Regenerated uv.lock (Celery 5.5.3 → 5.6.2)
• All unit tests pass ✅

This PR fixes #3458

Notes for Reviewers

• This is a dependency version bump to pull in an upstream bug fix
• No code changes required, only pyproject.toml and uv.lock updated
• Tested locally: Celery imports correctly and all tests pass

Signed commits

• Yes, I signed my commits.

[MoralCode]

marking as waiting behind #3336

[MoralCode]

#3336 has merged. This now requires a rebase but should be good to go as soon as that happens

[MoralCode]

taking this over

[sgoggins]

This docker build failure message is possibly not related to this PR. It suggests something is off. I do not think celery is the default queue name.

rror: q-1      | 2026-02-19 03:21:21.918387+00:00 [error] <0.749.0> Channel error on connection <0.741.0> (10.89.0.2:55950 -> 10.89.0.5:5672, vhost: 'augur_vhost', user: 'augur'), channel 1:
Error: q-1      | 2026-02-19 03:21:21.918387+00:00 [error] <0.749.0> operation queue.purge caused a channel exception not_found: no queue 'celery' in vhost 'augur_vhost'

[MoralCode]

@sgoggins that error is benign. i saw it when messing with the rabbit version and documented it as known benign on the wiki https://github.com/chaoss/augur/wiki

[MoralCode]

This does have a more serious error though in the docker build

Stack Trace

augur-1         | [2026-02-19 03:24:59,967: CRITICAL/MainProcess] Unrecoverable error: ImportError("cannot import name 'CredentialProvider' from 'redis' (/augur/.venv/lib/python3.11/site-packages/redis/__init__.py)")
augur-1         | Traceback (most recent call last):
augur-1         |   File "/augur/.venv/lib/python3.11/site-packages/celery/worker/worker.py", line 203, in start
augur-1         |     self.blueprint.start(self)
augur-1         |   File "/augur/.venv/lib/python3.11/site-packages/celery/bootsteps.py", line 112, in start
augur-1         |     self.on_start()
augur-1         |   File "/augur/.venv/lib/python3.11/site-packages/celery/apps/worker.py", line 136, in on_start
augur-1         |     self.emit_banner()
augur-1         |   File "/augur/.venv/lib/python3.11/site-packages/celery/apps/worker.py", line 170, in emit_banner
augur-1         |     ' \n', self.startup_info(artlines=not use_image))),
augur-1         |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
augur-1         |   File "/augur/.venv/lib/python3.11/site-packages/celery/apps/worker.py", line 232, in startup_info
augur-1         |     results=self.app.backend.as_uri(),
augur-1         |             ^^^^^^^^^^^^^^^^
augur-1         |   File "/augur/.venv/lib/python3.11/site-packages/celery/app/base.py", line 1452, in backend
augur-1         |     self._backend = self._get_backend()
augur-1         |                     ^^^^^^^^^^^^^^^^^^^
augur-1         |   File "/augur/.venv/lib/python3.11/site-packages/celery/app/base.py", line 1117, in _get_backend
augur-1         |     backend, url = backends.by_url(
augur-1         |                    ^^^^^^^^^^^^^^^^
augur-1         |   File "/augur/.venv/lib/python3.11/site-packages/celery/app/backends.py", line 69, in by_url
augur-1         |     return by_name(backend, loader), url
augur-1         |            ^^^^^^^^^^^^^^^^^^^^^^^^
augur-1         |   File "/augur/.venv/lib/python3.11/site-packages/celery/app/backends.py", line 49, in by_name
augur-1         |     cls = symbol_by_name(backend, aliases)
augur-1         |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
augur-1         |   File "/augur/.venv/lib/python3.11/site-packages/kombu/utils/imports.py", line 59, in symbol_by_name
augur-1         |     module = imp(module_name, package=package, **kwargs)
augur-1         |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
augur-1         |   File "/usr/local/lib/python3.11/importlib/__init__.py", line 126, in import_module
augur-1         |     return _bootstrap._gcd_import(name[level:], package, level)
augur-1         |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
augur-1         |   File "<frozen importlib._bootstrap>", line 1204, in _gcd_import
augur-1         |   File "<frozen importlib._bootstrap>", line 1176, in _find_and_load
augur-1         |   File "<frozen importlib._bootstrap>", line 1147, in _find_and_load_unlocked
augur-1         |   File "<frozen importlib._bootstrap>", line 690, in _load_unlocked
augur-1         |   File "<frozen importlib._bootstrap_external>", line 940, in exec_module
augur-1         |   File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
augur-1         |   File "/augur/.venv/lib/python3.11/site-packages/celery/backends/redis.py", line 12, in <module>
augur-1         |     from redis import CredentialProvider
augur-1         | ImportError: cannot import name 'CredentialProvider' from 'redis' (/augur/.venv/lib/python3.11/site-packages/redis/__init__.py)
augur-1         | Creating task logs

[MoralCode]

@ANJAN672 are you still interested in helping the maintainers merge this PR? I dont think it can move forward in its current state given the failing CI checks

[ANJAN672]

@ANJAN672 are you still interested in helping the maintainers merge this PR? I dont think it can move forward in its current state given the failing CI checks

Working on it now !!

[ANJAN672]

@MoralCode and @sgoggins , can u please review this!