estuary-cdk: specify PageCursor type parameters

Some linters complain about the `dict` variant in the PageCursor
definition not having any type parameters set. `str` has been picked for
the key, as that's what all connectors currently use. `JsonValue` is
used for values, PageCursors need to be JSON serialisable.

Author: nicolaslazo

estuary-cdk/estuary_cdk/capture/common.py

@@ -18,7 +18,8 @@
     Literal,
     TypeVar,
 )
-from pydantic import AwareDatetime, BaseModel, Field, NonNegativeInt
+
+from pydantic import AwareDatetime, BaseModel, Field, JsonValue, NonNegativeInt
 
 from ..cron import next_fire
 from ..utils import json_merge_patch
@@ -102,7 +103,7 @@ def pop_cursor_marker(cursor: dict) -> dict:
     return cursor
 
 
-PageCursor = str | int | dict | None
+PageCursor = str | int | dict[str, JsonValue] | None
 """PageCursor is a cursor into a paged result set.
 These cursors are predominantly an opaque string or an internal offset integer.
 When a dict is used, it represents a structured cursor that supports JSON merge patches