Update celery to 5.6.3

[killua156]

Bumps celery to 5.6.3.

5.6.x also changed runtime deps, so this updates them to match upstream:

• kombu >=5.6.0 (was >=5.5.2,<5.6; the old upper bound conflicts with 5.6.x)
• adds tzlocal and exceptiongroup >=1.3.0 (new required deps)

Also applies the test python >=${{ python_min }} fix from #108 so it builds on the latest rattler-build. Verified locally: imports, CLI tests, and pip check pass. Recipe-only change, not rerendered.

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/recipe.yaml) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipe/recipe.yaml:

• ℹ️ noarch: python recipes should usually follow the syntax in our documentation for specifying the Python version.

  • For the tests[].python.python_version or tests[].requirements.run section of the recipe, you should usually use the pin python_version: ${{ python_min }}.* or python ${{ python_min }}.* for the python_version or python entry.

• If the package requires a newer Python version than the currently supported minimum version on conda-forge, you can override the python_min variable by adding a Jinja2 set statement at the top of your recipe (or using an equivalent context variable for v1 recipes).

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/30038196337. Examine the logs at this URL for more detail.}

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/recipe.yaml) and found it was in an excellent condition.