feat(debian): add bullseye support

[SamJoan]

PR progress checklist (to be filled in by reviewers)

• Changes to documentation are appropriate (or tick if not required)
• Changes to tests are appropriate (or tick if not required)
• Reviews completed

---

What type of PR is this?

Primary type

• [build] Changes related to the build system
• [chore] Changes to the build process or auxiliary tools and libraries such as documentation generation
• [ci] Changes to the continuous integration configuration
• [feat] A new feature
• [fix] A bug fix
• [perf] A code change that improves performance
• [refactor] A code change that neither fixes a bug nor adds a feature
• [revert] A change used to revert a previous commit
• [style] Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc.)

Secondary type

• [docs] Documentation changes
• [test] Adding missing or correcting existing tests

Does this PR introduce a BREAKING CHANGE?

No.

Related issues and/or pull requests

N/A. No one has documented an attempt to run this formula on debian bullseye (testing) at this stage.

Describe the changes you're proposing

Hi there. Currently, installation on debian bullseye results in a broken APT configuration if use_upstream_repo is set to True. The string "postgresql-repo" string is entered into the /etc/apt/sources.list.d/pgdg.list file. This results in apt being unusable in the target system, which ideally should not happen.

My changes resolve this issue by adding support for debian bullseye (testing)

Pillar / config required to test the proposed changes

postgres:
  use_upstream_repo: True
  fromrepo: bullseye-pgdg
  version: '13'

Debug log showing how the proposed changes work

root@saltmain:/srv/formulas# salt 'unicornbottle-main' state.apply postgres.upstream
unicornbottle-main:
  Name: postgresql-pkg-deps - Function: pkg.installed - Result: Clean Started: - 15:21:26.534113 Duration: 23.875 ms
  Name: deb http://apt.postgresql.org/pub/repos/apt bullseye-pgdg main - Function: pkgrepo.managed - Result: Changed Started: - 15:21:26.559226 Duration: 6556.887 ms

Summary for unicornbottle-main
------------
Succeeded: 2 (changed=1)
Failed:    0
------------
Total states run:     2
Total run time:   6.581 s

Now configuration is set as follows:

# cat /etc/apt/sources.list.d/pgdg.list
deb http://apt.postgresql.org/pub/repos/apt bullseye-pgdg main

Documentation checklist

• Updated the README (e.g. Available states).
• Updated pillar.example.

Testing checklist

• Included in Kitchen (i.e. under state_top).
• Covered by new/existing tests (e.g. InSpec, Serverspec, etc.).
• Updated the relevant test pillar.

Additional context

This is debian's unstable branch. I'm personally using it to be a little more up to date as stability is not a concern for my current project. If I have any issues I'll update here with additional fixes, however I think that how the project is laid out everything should continue to work as this is a very small change which should not have many repercussions.

[myii]

Tested this locally with Kitchen on the new debain-11 pre-salted image that will be pushed out across all repos soon (i.e. default-debian-11-master-py3) -- all working fine, thanks.

[saltstack-formulas-travis]

🎉 This PR is included in version 0.42.0 🎉

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