chore(deps): update dependency ty to v0.0.78

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
ty (changelog)	==0.0.77 → ==0.0.78

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Release Notes

astral-sh/ty (ty)

v0.0.78

Released on 2026-09-02.

Bug fixes

• Defer decorator-call diagnostics to avoid recursive-default cycles (#​28226)
• Make cyclic intersection simplification deterministic (#​28156)
• Stabilize cyclic terminal-call reachability (#​28216)

Preview features

• Refresh uv workspace metadata when dependencies change (#​28224)

Diagnostics

• Add a new disjoint-cast rule (#​28129)
• Report deprecated property accessors on intersections (#​28250)
• Report deprecations for implicit constructor calls (#​28251)
• Report deprecations for overloads, operators, and properties (#​28134)
• Respect overload selection in deprecation diagnostics (#​28148)

Core type checking

• Fix negative narrowing for protocols with gradual members (#​28198)
• Preserve ParamSpec bindings inferred against type context (#​28084)
• Preserve generic protocol materialization relations (#​28246)
• Preserve uncertain branches during quantification (#​28211)
• Respect type variables in top/bottom materializations of invariant generics (#​28072)
• Sync vendored typeshed stubs (#​28217). Typeshed diff
• Treat captured bound-method receivers covariantly (#​28180)
• Unsound intersection simplification for generic iterables (#​28068)
• Validate type variable scopes in constructors and aliases (#​28130)
• lambda functions are always truthy (#​28254)

Performance

• Optimize materialized recursive protocol comparisons (#​28079)
• Optimize recursive protocol checks for nested type variables (#​28257)

Contributors

• @​charliermarsh
• @​sharkdp
• @​zsol
• @​AlexWaygood
• @​ibraheemdev
• @​carljm

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📚 Documentation preview 📚: https://objctypes--706.org.readthedocs.build/en/706/