Add --allow-downgrades capability for apt upgrade

[jakelyz]

What does this PR do?

Adds the ability to specify --allow-downgrades when calling upgrade with apt

What issues does this PR fix or reference?

Fixes: #52977

Previous Behavior

It was not possible to pass --allow-downgrades to apt, when using pkg.upgrade

New Behavior

The flag --allow-downgrades is able to be passed to apt when using pkg.upgrade

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

No

Please review Salt's Contributing Guide for best practices.

See GitHub's page on GPG signing for more information about signing commits with GPG.

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[Ch3LL]

Can you add a .. versionadded:: 3005 for this new arg?

[jakelyz]

Added in f517f10

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Detected Issues (click me)

Check Known Missing Docstrings...........................................Failed
- hook id: invoke
- duration: 1.39s
- exit code: 1
The function 'expand_repo_def' on 'salt/modules/aptpkg.py' does not have a 'CLI Example:' in it's docstring

Found 1 errors

---

Thanks again!

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