[BUG] `refresh_db` is deprecated for `pkgrepo.managed`

[myii]

Your setup

Formula commit hash / release tag

Versions reports (master & minion)

Pillar / config used

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Bug details

Describe the bug

As reported in the Slack #testing channel (which will disappear after a while).

https://saltstackcommunity.slack.com/archives/C7KKN9P6W/p1588231385039600

Rebuilt our pre-salted images at https://github.com/netmanagers/salt-image-builder after the CVE release and now beginning to run the tests of the master branch across the SaltStack Formulas. Got our first failures in the apt-formula, with a neon warning that's been reintroduced by a develop => master port 8 days ago (https://github.com/saltstack/salt/blame/master/salt/states/pkgrepo.py#L313-L318).

https://travis-ci.org/github/myii/apt-formula/jobs/681357767#L1517-L1530

RuntimeError: The warning triggered on filename '/usr/local/lib/python3.7/dist-packages/salt/states/pkgrepo.py', line number 315, is supposed to be shown until version 3000 is released. Current version is now 3000. Please remove the warning.

• Out of interest, why is a salt.utils.versions.warn_until() significant enough to trigger a RuntimeError?

Steps to reproduce the bug

Expected behaviour

Attempts to fix the bug

This line will need to be removed/adjusted:

https://github.com/saltstack-formulas/apt-formula/blob/baa83f2dc2a7ed593d00d1e3c784b47343fcfceb/apt/repositories.sls#L81

Additional context