Change signedby default directory to /etc/apt/keyrings

[Ch3LL]

Follow up to #61760 which is not in a released version so it does not require a changelog file.

This PR resolves the comments here: #59785 (comment)

[Ch3LL]

re-run full all

[Ch3LL]

re-run full all

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[github-actions]

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When I was created we had a lot of these. The documentation for these
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I noticed that in this PR there are some files changed that have some of these
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Well, my favorite, is that since you were making changes here I'm hoping that
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Detected Issues (click me)

Check Known Missing Docstrings...........................................Failed
- hook id: invoke
- duration: 1.45s
- exit code: 1
/home/runner/.cache/pre-commit/repoj_ywqv3d/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!