bpo-43207: InspectLoader.is_package is not an abstract method

[Isa-rentacs]

Making the description of InspectLoader.is_package aligned with the current implementation.

https://bugs.python.org/issue43207

Automerge-Triggered-By: GH:jaraco

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[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[Isa-rentacs]

@FFY00 Thank you for your approval, could you teach me what else is needed to push through this change?

[FFY00]

We need a core dev to merge this, and that is often hard as there is too much to do and too little time 😅

@jaraco would you be able to take a look when you have a moment?
This is a pretty straightforward fix, is_package used to be an abstract method, a concrete implementation was provided and the method bumped down to optional, but the documentation text was not updated.

[jaraco]

Looking at the report, this issue has been around since Python 3.4, so I'm backporting it to all Pythons receiving bug fixes.

[miss-islington]

Thanks @Isa-rentacs for the PR 🌮🎉.. I'm working now to backport this PR to: 3.10, 3.9.
🐍🍒⛏🤖

[bedevere-bot]

GH-26321 is a backport of this pull request to the 3.10 branch.

[bedevere-bot]

GH-26322 is a backport of this pull request to the 3.9 branch.