[pylint] Better inference for str.strip (PLE310)

[MichaReiser]

Summary

This PR stabilizes the behavior introduced in #15985

The new behavior improves the inference of str.strip calls:

• before: The rule only considered calls on string or byte literals ("abcd".strip)
• now: The rule also catches calls to strip on object where the type is known to be a str or bytes (e.g. a = "abc"; a.strip("//"))

The new behavior shipped as part of Ruff 0.9.6 on the 10th of Feb which is a little more than a month ago.
There have been now new issues or PRs related to the new behavior.

[codspeed-hq]

CodSpeed Performance Report

Merging #16671 will degrade performances by 4.61%

_{Comparing micha/pylint-str-strip-non-literals (0561c94) with micha/ruff-0.10 (6fc3434)}

Summary

❌ 1 regressions
✅ 31 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	red_knot_check_file[incremental]	5.2 ms	5.5 ms	-4.61%

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

[MichaReiser]

Closing and reopening to trigger another ecosystem run