bump celery from 5.2 to 5.3

[bowenliang123]

Description

• celery acts the backbone for async jobs in Dify and version 5.2 was released in Aug 2021
• celery 5.3 release notes and history: https://docs.celeryq.dev/en/v5.3.6/changelog.html
• no breaking changes
• brings compatibility to Python 2.12 and sqlalchemy 2.x in its tests

Type of Change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update, included: Dify Document

How Has This Been Tested?

• tested locally by running the modules of API and worker, which depends on celery

Suggested Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods
• optional I have made corresponding changes to the documentation
• optional I have added tests that prove my fix is effective or that my feature works
• optional New and existing unit tests pass locally with my changes

[takatost]

LGTM