Fix warning of beta version for debian based releases

[gurkanindibay]

There is a warning for debian based releases for beta packages. Fix the versioning schema and remove the warning
https://github.com/citusdata/packaging/runs/5677313562?check_suite_focus=true#step:6:2161

[hanefi]

I had a hard time finding the warning message. Anchors in Github Actions workflow run links do not always work.

Here is the warning message in question:

W: postgresql-14-citus-beta-11.0-dbgsym: rc-version-greater-than-expected-version 11.0.0-beta.citus > 11.0.0 (consider using 11.0.0~beta.citus)