need to update to match poetry's new sources

[jeffwidman]

Code improvement description

saw this in passing while skimming the 1.5 changelog, we need to account for it as we have at least one unit test of the deprecated flags, indicating we look for the old keys at least...

<rest of issue description is WIP as I'm about to head to bed, will fill this in more in the morning>

• Introduce priority key for sources and deprecate flags default and secondary (#7658).

[donbowman]

[[tool.poetry.source]]
url = "https://git.agilicus.com/api/v4/projects/328/packages/pypi/simple"
name = "common"
priority="primary"

[[tool.poetry.source]]
name = "PyPI"
priority = "primary"

this causes dependabot to break.

--------Check platform/messages gunicorn 20.1.0
/bot/vendor/ruby/3.1.0/gems/dependabot-python-0.232.0/lib/dependabot/python/helpers.rb:23:in `run_poetry_command': The Poetry configuration is invalid: (Dependabot::SharedHelpers::HelperSubprocessFailed)
  - [source.0] Additional properties are not allowed ('priority' was unexpected)
  - [source.1] Additional properties are not allowed ('priority' was unexpected)
  - [source.1] 'url' is a required property