Symfony 4.4 and 5.0 shipped the same day on purpose

21 November brought both, with identical features — 4.4 is the LTS with deprecations still present, and 5.0 is the same code with them removed.

# the upgrade path this is designed for:
#   1. move to 4.4
#   2. run the test suite with deprecations reported
#   3. fix every one
#   4. change the constraint to ^5.0 — and nothing else changes

$ SYMFONY_DEPRECATIONS_HELPER='max[total]=0' vendor/bin/phpunit

That is a genuinely good release policy and it is worth using as intended rather than jumping straight to 5.0. The deprecation helper turns every triggered deprecation into a test failure, which converts “upgrade the framework” from an open-ended task into a list with a length. 4.4 is supported until November 2023, so there is no urgency — the urgency is in doing step three while the deprecations are still reported, because 5.0 simply removes the code.