fix: correct typing for cached function

[liblaf]

This PR fixes typing issue cachebox.cached applied on an instance method:

import cachebox


class A:
    _cache: cachebox.BaseCacheImpl

    def __init__(self) -> None:
        self._cache = cachebox.Cache(128)

    # before PR: Argument of type "(self: Unknown) -> Unknown" cannot be assigned to parameter "cache" of type "BaseCacheImpl[Unknown, Unknown] | dict[Unknown, Unknown] | None" in function "cached"
    # after PR: no error
    @cachebox.cached(lambda self: self._cache)
    def method(self, *args, **kwargs) -> None: ...

[Copilot]

Pull request overview

This PR fixes a typing issue in the cachebox.cached decorator to properly support callable cache providers when used with instance methods. The cached function already supported callable cache providers in its implementation (allowing patterns like @cachebox.cached(lambda self: self._cache)), but the type hint was missing this option, causing type checkers to report errors.

Changes:

• Updated the type hint for the cache parameter in the cached function to include typing.Callable[..., BaseCacheImpl] in the union type

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