Downgrade watchfiles

[FilipeNas]

Description

When starting a new cookiecutter project with celery, it show the following error messages:

Error: No nodes replied within time constraint
Celery workers not available.

And also:

_rust_notify.WatchfilesRustInternalError: error in underlying watcher: IO error for operation on <path>: No such file or directory (os error 2)

Options used:

python_version = "3.12"
cloud_provider = 4
use_async = n
use_celery = y

It can be fixed by downgrading watchfiles again to 21.0
I followed this discussion encode/uvicorn#2361

Checklist:

• I've made sure that tests are updated accordingly (especially if adding or updating a template option)
• I've updated the documentation or confirm that my change doesn't require any updates

Rationale

Fix for #5242

[browniebroke]

Issue in watchfiles repo: samuelcolvin/watchfiles#282

[browniebroke]

Thanks!