[AIRFLOW-2544] Guard against next major release of Celery, Flower #3439
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JIRA
Description
This PR proactively guards against the next major version of Celery (4.2) from being installed automatically until it's been tested. It is currently in RC but not yet officially released. I've also added an upper bound on Flower 1.0 similarly.
Related to https://issues.apache.org/jira/browse/AIRFLOW-1967, and created from discussion in #2806.
Tests
n/a - just a dependency version guard
Commits
Documentation
n/a
Code Quality
git diff upstream/master -u -- "*.py" | flake8 --diff