pin celery to 5.2.3

- prior to [5.2.3](https://github.com/celery/celery/blame/v5.2.3/requirements/default.txt#L1) the pinning for pytz in celery was `pytz>0.dev.0` or `pytz>dev` which now creates problems:
- we updated the pinning to 5.2.3 in 22.01 anyway

see also #18472
and https://pradyunsg.me/blog/2024/05/13/pip-24-1-betas/

lib/galaxy/dependencies/dev-requirements.txt

@@ -28,7 +28,7 @@ bx-python==0.8.11; python_version >= "3.6"
 cachecontrol==0.11.7; python_version >= "3.6" and python_version < "4"
 cached-property==1.5.2; python_version < "3.8" and python_version >= "3.6"
 cachetools==4.2.2; python_version >= "3.5" and python_version < "4.0" and (python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.6.0")
-celery==5.0.5; python_version >= "3.6"
+celery==5.2.3; python_version >= "3.6"
 certifi==2020.12.5; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version < "4" and python_version >= "3.6"
 cffi==1.14.5; implementation_name == "pypy" and python_version >= "3.6" and (python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.4.0")
 chardet==4.0.0; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version < "4"