fix: make JsonSerializable type alias read-only (#1072)

Bumping `ty` to 0.0.83 fails type-check: it rejects e.g. `list[dict[str,
int]]` as `JsonSerializable` because `list`/`dict` are invariant.

Fix: `JsonSerializable` uses read-only `Mapping`/`Sequence`, so callers
can keep passing plain dicts and lists. The alias is only used for
inputs that get serialized.

The lock bumps only `ty` to 0.0.83 so CI proves the fix; unit tests
pass; also clears the `push_items` error in apify-sdk-python.

Author: Pijukatel

src/apify_client/types.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from collections.abc import Mapping, Sequence
 from datetime import timedelta
 from typing import Literal
 
@@ -38,7 +39,7 @@
 matching the Apify API spelling.
 """
 
-JsonSerializable = dict[str, 'JsonSerializable'] | list['JsonSerializable'] | str | int | float | bool | None
+JsonSerializable = Mapping[str, 'JsonSerializable'] | Sequence['JsonSerializable'] | str | int | float | bool | None
 """Recursive type for JSON-serializable values - primitives plus objects and arrays with JSON-serializable contents.
 
 Based on the definition discussed in https://github.com/python/typing/issues/182.