fix(modules/aptpkg): fix recent regressions introduced in salt.modules.aptpkg

[myii]

What does this PR do?

Resolve recent regressions in salt.modules.aptpkg, encountered when using the pkgrepo.managed state.

CC: @Ch3LL.

What issues does this PR fix or reference?

• Fixes [BUG] Recent regression in aptpkg: Failed to configure repo ...': 'str' object has no attribute 'name' #62175
• Fixes [BUG] Recent regression in aptpkg: Traceback: KeyError: 'index' #62176

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?

Yes

[Ch3LL]

Note for reviewers: this does not require a changelog since the new signedby code has never made it to a release.

[Ch3LL]

re-run full all

[Ch3LL]

re-run full all

[github-actions]

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Detected Issues (click me)

Check Known Missing Docstrings...........................................Failed
- hook id: invoke
- duration: 1.05s
- exit code: 1
/home/runner/.cache/pre-commit/reporaptzk2i/py_env-python3/lib/python3.9/site-packages/_distutils_hack/init.py:30: UserWarning: Setuptools is replacing distutils.

warnings.warn("Setuptools is replacing distutils.")

The function 'expand_repo_def' on 'salt/modules/aptpkg.py' does not have a 'CLI Example:' in its docstring

Found 1 errors

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Thanks again!