ref(scope): Fix get_client typing

The `Scope.get_client` method is typed as returning `sentry_sdk.client.BaseClient`, but because `sentry_sdk.client` was not imported, the type was resolved as `Any`. This change imports `sentry_sdk.client` to fix the type hints.

sentry_sdk/scope.py

@@ -185,6 +185,7 @@ class Scope(object):
         "_propagation_context",
         "client",
         "_type",
+        "_last_event_id",
     )
 
     def __init__(self, ty=None, client=None):
@@ -207,6 +208,9 @@ def __init__(self, ty=None, client=None):
         incoming_trace_information = self._load_trace_data_from_env()
         self.generate_propagation_context(incoming_data=incoming_trace_information)
 
+        # self._last_event_id is only applicable to isolation scopes
+        self._last_event_id = None  # type: Optional[str]
+
     def __copy__(self):
         # type: () -> Scope
         """
@@ -1640,3 +1644,6 @@ def should_send_default_pii():
 
 # Circular imports
 from sentry_sdk.client import NonRecordingClient
+
+if TYPE_CHECKING:
+    import sentry_sdk.client