fix pylint errors on all() and filter()

[bckohan]

closes #898

pylint is reading the ... in the type hint stubs in the TYPE_CHECKING block and incorrectly inferring no-return type. This fixes the check by inserting dummy returns. There is no runtime change.

[Copilot]

Pull request overview

This PR addresses pylint false positives from type-only method stubs in PolymorphicManager by replacing ellipsis bodies with dummy return implementations, with no runtime behavior change.

Changes:

• Adds return bodies for TYPE_CHECKING-only all() and filter() manager stubs.
• Bumps package version from 4.11.3 to 4.11.4.
• Adds a changelog entry for issue #898.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

File	Description
src/polymorphic/managers.py	Updates type-checking-only method stubs to avoid pylint no-return inference.
src/polymorphic/__init__.py	Updates runtime package version constant.
pyproject.toml	Updates project package version metadata.
docs/changelog/index.rst	Documents the pylint fix in the changelog.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/polymorphic/__init__.py	100.00% <100.00%> (ø)
src/polymorphic/managers.py	98.66% <ø> (ø)
src/polymorphic/related_descriptors.py	100.00% <ø> (ø)

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