Recognize slice and frozendict generics

[ntBre]

Summary

This PR updates our standard library generic recognition to include frozendict and slice. F401
is just an example of an affected rule because we visit the subscript arguments of known stdlib
generics as type expressions:

ruff/crates/ruff_linter/src/checkers/ast/mod.rs

Lines 2177 to 2181 in 275e611

	// Ex) Optional[int]
	Some(typing::SubscriptKind::Generic) => {
	self.visit_type_definition(slice);
	self.visit_expr_context(ctx);
	}

Test Plan

mdtests including F401 to exercise the new behavior

[astral-sh-bot]

ecosystem-analyzer results

No diagnostic changes detected ✅

Full report with detailed diff (timing results)

[astral-sh-bot]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.