Tox has [released 4.9.0](https://github.com/tox-dev/tox/releases/tag/4.9.0) which fixed a bug where non existing environments did NOT fail, so since tox 4.9.0 they now DO fail: https://github.com/tox-dev/tox/issues/2858

We are relying on the previous behavior (the bugged one) so until we can fix it, I'm limiting tox as it breaks every PR right now which is worse than the limitation itself (which is not recommended).

We need to fix this soon so we can remove this limitation @auvipy @thedrow 
Limit tox to < 4.9. Tox has [released 4.9.0](https://github.com/tox-dev/tox/releases/tag/4.9.0) which fixed a bug where non existing environments did NOT fail, so since tox 4.9.0 they now DO fail: https://github.com/tox-dev/tox/issues/2858

We are relying on the previous behavior (the bugged one) so until we can fix it, I'm limiting tox as it breaks every PR right now which is worse than the limitation itself (which is not recommended).

We need to fix this soon so we can remove this limitation @auvipy @thedrow 
blank_issues_enabled: false
contact_links:
  - name: Kombu Issue Tracker
    url: https://github.com/celery/kombu/issues/
    about: If this issue only involves Kombu, please open a new issue there.
  - name: Billiard Issue Tracker
    url: https://github.com/celery/billiard/issues/
    about: If this issue only involves Billiard, please open a new issue there.
  - name: py-amqp Issue Tracker
    url: https://github.com/celery/py-amqp/issues/
    about: If this issue only involves py-amqp, please open a new issue there.

blank_issues_enabled: false
contact_links:
  - name: Kombu Issue Tracker
    url: https://github.com/celery/kombu/issues/
    about: If this issue only involves Kombu, please open a new issue there.
  - name: Billiard Issue Tracker
    url: https://github.com/celery/billiard/issues/
    about: If this issue only involves Billiard, please open a new issue there.
  - name: py-amqp Issue Tracker
    url: https://github.com/celery/py-amqp/issues/
    about: If this issue only involves py-amqp, please open a new issue there.
